French Onion Chicken Casserole

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. 😉

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 yogurt 
  • Add veggies—sliced carrots, peas, broccoli florets, and shredded zucchini are all good choices 
  • 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. 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. I like to divide the leftovers into single serve portions. Store the portions in  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. 

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!

YUM!

Serve french onion chicken casserole with any of the following:

For more great chicken casserole recipes, check out:

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French Onion Chicken Casserole Recipe

4.72 from 45 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 277 kcal
Author Lil' Luna

Ingredients

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

Instructions
 

  • Preheat oven to 350 and coat a 9x13 baking dish with cooking spray.
  • In a large bowl, stir celery, cheese, sour cream, mayo and cream of chicken. Add chicken and almonds. Spoon into dish.
  • Bake uncovered for 30 minutes. Sprinkle fried onion and cook another 5 minutes. Let stand 5-10 minutes. Enjoy!

Video

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About the Author

Kristyn Merkley

My name is Kristyn and I’m the mom of SIX stinkin’ cute kids and the wife to my smokin’ hot hubby, Lo. My mom’s maiden name is Luna, and I’m one of the many crafty “Lil’ Lunas” 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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Comments:

  1. ok question. Haven’t made this yet but interested as I love fried onions! But one ingredient has me stumped. Never heard of slivered almonds in a casserole type dish. Do they stay solid and crunchy or do they soften and just blend in for flavor?

  2. 5 stars
    I DID MAKE A FEW CHANGES: i WAS OUT OF SOUR CREAM, SO I THREW IN A CAN OF CREAM OF MUSHROOM INSTEAD, AND THEN I THOUGHT WHY NOT THROW IN SOME MUSHROOMS TOO!

    aS WRITTEN, i THINK THE RECIPE WOULD HAVE BEEN JUST AS TASTY though. Family loved it! We will definately make this again!

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