French Onion Chicken Casserole

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Just 10 minutes of prep time and you have a delicious creamy concoction of chicken, celery, and cheese topped with crispy fried onions! French Onion Chicken Casserole will become a new favorite dinner!

If you think you don’t like casseroles, then you probably just haven’t tried the right one… We have several favorite chicken casseroles, like a chicken crescent roll casserole, chicken and broccoli casserole, and this recipe!

French onion chicken bake in a glass casserole dish

A casserole for even the pickiest eaters

I really don’t like being a picky eater, but I am. Yes, it’s true… I can’t stand onions. They gross me out. BUT, having said that I actually like french fried onions… maybe the fact they’re breaded and fried makes them okay. ๐Ÿ˜‰

This next recipe I’m sharing is topped off with those delicious french fried onions and filled with all sorts of goodness like chicken, cheese, sour cream, mayo and almonds. It is DELICIOUS!

The best thing about this French Onion Chicken Casserole is that it takes little prep time. Literally, it takes minutes to throw together if your chicken is already made. You can buy cooked, chopped chicken, but I like to bake my chicken earlier in the morning.

scoop of french onion casserole on a white plate

10 minute prep

Although it takes awhile to bake, it really only takes about 5 minutes of prep work. Add that with the 5 minutes it takes to put this casserole together and you’re looking at about 10 minutes of work.

PREP. Preheat oven to 350 and coat a 9×13 baking dish with cooking spray.

CASSEROLE. In large bowl, stir celery, cheese, sour cream, mayo and cream of chicken. Add chicken and almonds. Spoon into dish. Bake uncovered for 30 minutes.

TOPPING. Sprinkle fried onion and cook another 5 minutes. Let stand 5-10 minutes. Enjoy!

Tips and variations

Here are a few ideas to tweak the recipe to make it a little more healthy:

  • Use a low fat Mayo and sour cream
  • Substitute all or a portion of the Mayonnaise with a low fat greek yogurtย 
  • Add veggiesโ€”sliced carrots, peas, broccoli florets, and shredded zucchini are all good choicesย 
  • Make it even more keto friendly and sprinkle cooked chopped bacon bits on top
  • Serve over white or brown rice, pasta, cauliflower rice, or zucchini pasta

Make it ahead.ย Assemble the casserole cover with plastic wrap and store in the fridge for a day. If freezing, then add another layer of aluminum foil and freeze for 2-3 months. Thaw overnight in the fridge before baking. Do not add the fried onions until the last 5 minutes of baking time.

Storing Leftovers.ย I like to divide the leftovers into single serve portions. Store the portions inย  airtight containers and keep in the fridge for days. To reheat quickly, use the microwave. If you have a little more time reheat in the oven.

The fried onions may become mushy as it sits in the fridge. To crisp them back up simply stick the casserole under the broiler. Watch carefully as they can go from soggy to burnt really quickly.ย 

French Fried Onion Chicken Casserole in a glass baking dish

We used celery for this recipe, but I think I’ll try French Style Green Beans when I make it next. I think even broccoli would be a great addition!


Serve french onion chicken casserole with any of the following:

For more great chicken casserole recipes, check out:

French Onion Chicken Casserole

4.65 from 42 votes

Just 10 minutes of prep time and you have a delicious creamy concoction of chicken, celery, and cheese topped with crispy fried onions!

Course Main Course
Cuisine American
Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings 12
Calories 340 kcal
Author Lil' Luna


  • 3 cups cooked chicken chopped
  • 1 cup celery chopped (or french style green beans)
  • 1 cup cheddar cheese shredded
  • 1 cup sour cream
  • 1 cup mayo
  • 1 can cream of chicken
  • 1/2 cup slivered almonds
  • 6 oz French's fried onions


  1. Preheat oven to 350 and coat a 9x13 baking dish with cooking spray.

  2. In a large bowl, stir celery, cheese, sour cream, mayo and cream of chicken. Add chicken and almonds. Spoon into dish.

  3. Bake uncovered for 30 minutes. Sprinkle fried onion and cook another 5 minutes. Let stand 5-10 minutes. Enjoy!

Recipe Video


Kristyn Merkley

My name is Kristyn and Iโ€™m the mom of SIX stinkinโ€™ cute kids and the wife to my smokinโ€™ hot hubby, Lo. My momโ€™s maiden name is Luna, and Iโ€™m one of the many crafty โ€œLilโ€™ Lunasโ€ in the fam. On this site I like to share all things creative – from recipes to home decor to gifts and home decor ideas. Welcome!

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Recipe Rating


    1. 5 stars
      I made this for my family tonight. We all loved the flavor, but I think I’ll add some crispy bacon next time for a little extra crunch. Great recipe! I’ll definitely be adding it into my rotation.

  1. This is probably good, but I can’t see any reason for it; that is, there is nothing added but a lot of high fat, no-reason mayo, sour cream, french-fried onions, and a bit of celery. If it had VEGETABLES, and maybe either rice or noodles of some kind, it might be worthwhile, but as it stands here, I’d feel as if I was swallowing nothing but mayo and sour cream–both of which I like, in their places–without gaining one bit of real nutritional value.

      1. 4 stars
        I agree! Joyce, no one is forcing you to make/eat this! I think it looks yummy! Not exactly heart-healthy, but we’re adults here and can decide for ourselves.

        1. You can always take things out or add what you like. That’s whats great about recipes. If you know healthier substitutes, then add those and share what you tried. I’d love to know, so we can pass that along:)

          1. I’m looking to make this as well! That does seem like a lot of mayo… if I take some out do you think it will be missed? And a good substitute for sour cream is plain greek yogurt! I use that on my taco/mexican dishes and you can NOT tell a difference.

          2. You definitely don’t have to add as much! I don’t know if that will change anything, since I haven’t tried. And, yes, greek yogurt is a great substitute!! Let me know what you think!! Thanks a lot!

      2. Agree. Can’t stand someone lingering with snide remarks when it isn’t necessary. Why did you come on here? Not every recipe is for everybody. No need to pretend you are superior and to be rude to the poster over the recipe and others who like it. I generally don’t make comments on Pinterest related sites, but the rudeness is provoking, but then maybe she wanted it that way???

      3. I agree with Joyce and I am sure many others do also. She has a right to her opinion. Haters gonna hate, hate, hate.

        1. OK Marvin! This kind of talk happens because both were once losers in high school! BTW… My hubby loved this recipe!

    1. I don’t usually comment, but this is by FAR the RUDEST most unwarranted comment I have EVER seen from a grown adult! If you “see no need for it” then don’t make it and move along!!! It’s one thing to comment saying you made it and weren’t pleased, or even comment offering up suggestions and changes, but to come here lecturing people with your want-to-be professional dietician opinions is ridiculous! If YOU don’t like it, don’t make it! But don’t think for a second that your snooty comment is going to prevent others from making it! Goodness, go find some happiness in your bitter life!

      1. Well said!! Her rude comment was unnecessary and unwarranted!! If she doesnโ€™t like it then keep moving along! Smh

    2. 3 stars



    3. She HAs a list of suggestions for making the recipe healthier, like substituting low-fat mayo, low-fat sour cream and one can even substitute low-fat, heart healthy cream soups. There are all kinds of ways to make this healthier, so how about reading the entire post before making your rude comments. And then, how about, if you donโ€™t like what you see just move along, rather than being a rude, condescending jerk!

  2. Tried this tonight and it was amazing! I added a few things to it. I put a layer of white rice on the bottom of the 9×13 pan. Then I added sauteed onions, carrots in addition to the celery. It was amazing!

    1. Did you cook the rice first? If not, did you use instant rice? I love the idea of rice, I’m just not sure how to incorporate it. My chicken dishes always end up dry…

  3. This looks delicious – can’t wait to make it! When you listed ‘cream of chicken’ in the ingredient list do you mean a can of cream of chicken soup and if so do I add water or anything to it?

  4. Hi! This looks delicious. Do you know how many carbs per serving on it in? I’m on a low carb diet, but want to try this!! ๐Ÿ™‚

  5. 4 stars
    This was really good! I made it with a can of french-style green beans instead of the celery. My whole family liked it. Even my two little kids, ages 3 and 6, who don’t normally like regular green-bean casserole ate it. (They were hesitant at first but once they tried it, they cleaned their plates!) My 11yo has requested that I make it again for sure!

  6. Just a hint for those who don’t like “real” onions. To keep the real onions and flavor, AND to please the picky eaters, I use a cheese grater to grate the onion into soups, stews, and casseroles.

  7. I used French style green beans instead of the celery, and added mushrooms and penne pasta. It was a little dry. I think baking it covered would help or increase wet ingredients to 1 1/2 cups. Tasty.

  8. Going to make this for a friend who lost her husband and I want her to be able to freeze it. If I do the first round of cooking and then add the onions part, will that work? Or will they burn when she heats it back up? Any suggestions most welcome. This looks like a good chix casserole but wanted to make something she could freeze in case she has too much food already. Thanks!

    1. So sorry to hear that!! I haven’t put it in the freezer yet, but I would maybe leave the onions off and give those to her separately to add on. That is only if you are wanting her to freeze it & not eat it, right away. Hope that helps!!

    1. Sorry it didn’t turn out quite how you thought. Haven’t had it come out soupy, so wondering what made it that way. If you like something other than mayo to substitute you could or maybe use a little less. Hope you’ll try it again ๐Ÿ™‚

  9. My mother made this for my husband and I to eat after the birth of our son. She gave it to us frozen, cooked, with the onions to add to the top after we reheated it. We’ve eaten a million casseroles in the last month, and this is the winner!! It is incredible, we served with green beans on the side and I will make it again soon.

  10. Made this last night. I used green beans and celery. It was very good. Next time I think I will add hash browns too. Very good recipe as is!! Will definitely make it again!

  11. I made this tonight with the following changes: added 1/4 cup chopped onion, replaced half the mayo with cheddar cheese soup (Campbell’s canned), added 1 tablespoon garlic powder, 1 tsp black pepper, and sprinkled a little cheddar over the top along with the French onions and used light versions of the sour cream and mayo. It ended up being 8 servings at 361 calories per serving. Definitely not a crazy calorie number for something like this. It was DELICIOUS!!!! Thank you for sharing this wonderful recipe! We’ll definitely make it again!

  12. Anyone ever try this in the crockpot? I love recipes that I can through in in the morning and this seems like it would work. Just through everything in except thr onions until the last 30 minutes or so?

  13. 5 stars
    This one is a keeper! Husband loved it! I don’t understand the comments from the folks who said theirs was soggy. Mine came out perfect. I’m going to stash some of these in the freezer, and add the onions at the end. BTW, I added some of the french fried onions into the actual casserole. Yum!

  14. I added bacon and bulked it up with 2 cups cooked pasta. It has become my family’s go to comfort food!

  15. I bulked this up with 2 cups cooked pasta and 8 strips thick cooked bacon, chopped up. It is my family’s go to comfort food!

  16. 5 stars
    I’ve made this twice now. The first time had too much mayo. I cut it in half and substituted more sour cream. Much better the second time! The men in my house really like it.

          1. 5 stars
            I just made this and my family absolutely loved it! Served tomato cucumber salad and Hawiian rolls on the side. So easy to make and delicious. Thanks so much!

  17. 5 stars
    Thanks for the great dinner idea. To make it a little healthier I used 1 and 1/2 cup lite sour cream and 1/2 cup lite cream cheese instead of mayo. It still came out so creamy. This one’s a keeper, thanks!

  18. 5 stars
    I have made this several times, each time tweaking it just a little for our family’s liking ๐Ÿ™‚ The 1st time I followed the recipe exactly as is, it was very soupy! I am in weight watchers so I changed up a few things to make it a little healthier. The few changes I used were:
    green beans instead of celery (pure preference)
    Cut out the mayo completely (honestly couldn’t even tell)
    Used Greek yogurt in place of sour cream, dont use quite a full 1/2 cup

    So for whoever had negative comments, the way I made it was very healthy, contained chicken, Greek yogurt, green beans, cheese and 1 can of soup, most of which are healthy items ๐Ÿ™‚

    Thank you Lil Luna for the great recipe!

  19. 5 stars
    This is the 3rd time making this. I substitute cream of mushroom for the mayo and use the French style green beans. Delicious!!

  20. 5 stars
    Made this tonight and the entire pan was gone!!! I left out the celery cause my crew doesn’t care for it. I added 2 cups shredded zucchini well drained. My picky husband ate 3 helpings!!!! Will definitely make again!!! Thanks!!!

  21. Just made this for dinner tonight and it was very good. Made it with the French green beans instead of the celery, and since husband doesn’t like mayo baked in anything, I substituted it with a cup of Cambells nacho cheese soup. Also added some onion powder. It was a big hit and will be one recipe I’ll make again.

  22. Huge difference without the slivered almonds? I hardly ever buy those and hate them just sitting in the cabinet for the next recipe I use them with. Can’t wait to make this with the green beans!

  23. My husband was very pleased with this dish. I only used a half of stock of celery and a can of mixed vegetables. I also added a little poultry seasoning and garlic and herb seasoning. Very good recipe.

  24. 4 stars
    Thanks for sharing! I loved the idea, but wanted to slim it down a bit. Itโ€™s only me and my husband so I didnโ€™t want to make too much! I used one 12 oz chicken breast, one can of cream of mushroom (itโ€™s what I had in the cupboard), one can of French style green beans, about 1/2 cup cheese and about 1/2 a can of frenchโ€™s Fried onions, some mixed in and the rest on top. We put the casserole over some rice. It came out perfect! Super yummy! Canโ€™t wait to have leftovers for lunch tomorrow!

  25. 5 stars
    Excellent casserole! I did not have celery or green beans so I threw in a bag of sweet peas and celery seeds! Love it!!

  26. 5 stars
    I think Joyceโ€™s comment was very rude as well! There are a lot of things you can do to take out some of the fat. You can use light sour cream and mayo. They even sell heart healthy cream of chicken soup. Just about all recipes can be tweaked for ones dietary life style. Anxious to make this!

  27. Too much liquid. I added wide egg noodles and would still cut the sour cream and mayo to 1/2 cup each. Also added peas instead of green beans and bacon bits.

  28. 5 stars
    This recipe is great for low-carb dieters. I made this dish with 4 chicken breasts, 1/2 cup mayo, and the rest of the ingredients listed. Tasty!

  29. This same recipe was served at a dinner party , and the hostess had added chopped green chiles which really zipped it up! That sets it apart from an ordinary chicken casserole.

  30. 4 stars
    I just made this and found it easy & delicious. I halved the recipe, as I’m collecting recipies for 1 or 2. I used leftover rotisserie chicken & baked in a glass loaf pan. It was a bit salty for me, so I’ll look for a low sodium soup next time. Loved the crunch of the nuts & french fried onion rings!

  31. This is so yummy! Just found the recipe recently and it’s a keeper! Love casseroles for an easy meal! ????????????????????5 star worthy!

  32. 5 stars
    I’ve made this 5-6 times. Soooo yummy. I have made it with celery, fresh BROCCOLI, and canned green beans and they all turned out great, I personally pole green beans bc it reminds me of green bean casserole which I only eat around the holidays. Maybe it’s not the “healthiest”…casseroles usually aren’t, in my experience, but it’s such a great comfort meal, like Mac n cheese or meatloaf.

  33. 5 stars
    I make this all the time it is delicious, i make it in the toaster oven for just the two of us! The next day tastes even better! I donโ€™t meaure everything and i never have almonds but it still tastes great.

  34. 4 stars
    It has really good flavor. I cut 4 chicken breasts into bIte size pieces and made plain (just Salt and pepper) macaroni on the side. Next time i would half or 1/4 the mayo and sour cream. Just too rich and creamy for my family.

  35. 5 stars
    Love this! Such a hit in my house. Was gone in a few Min. I did only ise 1/2c of mayo and put cream of muShroom in it and added 2 cans of beans and a cup of broccoli ๐Ÿ™‚ so delicious!


  37. 5 stars
    This recipe was absolutely delicious. Not too soupy at all. Used green beans instead of celery. Thank you for sharing.

  38. Wow, this recipe sounds so good. It might even be better with parmesan cheese as well as cheddar in the recipe.. To make it a notch up from the already goodness of it. Thanks for the recipe.

  39. 5 stars
    My family thoroughly enjoyed this casserole. I placed fresh spinach on the dish before adding the chicken etc. Also added chopped onion and 2 chopped garlic cloves. I softened celery, onion, garlic with a little butter in Micro.
    Thank you for sharing. I will definitely fix it again.

  40. 5 stars
    Delicious! Just like green beAn CASSEROLE with chicken. DEFINITELY sub the celery With the green beans. Everybody loved it! Paired With a garlic baguette and steamed carrots.
    Will make again!

  41. 5 stars
    This was so delicious. EVen my picky 13-year Old eater was going back for seconds.

    I added BROCCOLI FLORETS and frozen peas, but left ouT the celery as i forgot to buy it.

    Will definitely be making this again!

  42. 5 stars
    We tried this tonight with a few changes. We added

    1 can cream of mushroom
    Extra cup-2 cups chicken
    Green beans instead of celery
    Dashes of
    garlic powder
    Onion powder
    Cayenne powder

    Hubby loves it and request it being part of a regular rotation

    Thank you!

  43. 5 stars
    This recipe is a total Hit in my family!

    I have made some tweaks that brings this casserole to the next level:

    1) i always use Frozen cut greEn beans for an added โ€œcrunchโ€
    2) i mix about half of the french onions into the casserole (a la green bean casserole)
    3) at the end of cooking, i mix A cooked bag of egg noodles into the casserole and cook for five minutes on broil

  44. 5 stars
    I love this casserole! I sauteed portebello mushrooms in butter and white wine and used them instead of celery or green beans. It is really amazing. thank you!

  45. 3 stars
    Just FINISHED eating this. A bit too much mayo. I Seasoned the CHICKEN with garlic powder, onion powder and paprika. The casserole i added frozen peas and carrots. I also seasoned the casserole with some dried paRsley and thyme. I will try this again and Reduce the mayo.