Today’s Mashed Potato Casserole is the ultimate creamy, cheesy potato side dish! It’s a Merkley favorite and one we make for so many holidays.
It’s loaded with sour cream, cream cheese, cheddar, parmesan and bacon. Yes, all the best things in one delicious dish! It has all the flavors of loaded mashed potatoes baked into an easy 9×13 casserole, which means we love making it for Thanksgiving, Christmas, Easter, Sunday dinners, and potlucks.
With so many great ingredients, it’s not only delicious but feeds a crowd and can be prepped ahead, making it one of our favorites to prep for the holidays.
For more favorite potato sides, be sure to check out our Funeral Potatoes, Twice Baked Potato Casserole, and classic Mashed Potatoes.
Why You’ll Love It + Why it works:
- Feeds a Crowd: Bakes in a 9×13 pan, making it perfect for holidays and potlucks.
- Make Ahead and Save Time: Great make-ahead side dish for busy family dinners and holiday meals.
- Cream Cheese and Sour Cream Keep it Creamy: They add richness and help the potatoes stay soft after baking.
- Cheese and Bacon go Inside and on Top: Mixing some in and saving some for the topping gives flavor in every bite and a pretty finish.
Mashed Potato Casserole Ingredients
- Potatoes, peeled and cubed (5 pounds): Creates the creamy mashed potato base and make the casserole hearty.
- Sour cream (1 cup): Adds creaminess and tang to the mashed potatoes.
- Butter (½ cup): Adds buttery flavor and helps make the potatoes smooth.
- Cream cheese, cubed (8 ounces): Makes the casserole extra creamy and rich. We always use full fat cream cheese.
- Milk (½ cup): Helps loosen the potatoes and create a smooth texture.
- Garlic salt with parsley flakes (2 teaspoons): Seasons the potatoes with garlic flavor, salt, and a little herb flavor.
- Pepper (to taste): Adds seasoning and balances the richness.
- Bacon, cooked, chopped, and divided (12 slices): Adds smoky flavor and a delicious topping. We prefer to make Bacon in the Oven but you can also use a microwave bacon if you’re in a rush.
- Cheddar cheese, divided (2 cups): Melts into the potatoes and creates a cheesy topping.
- Parmesan cheese (½ cup): Adds salty, nutty flavor and makes the potatoes even more flavorful.
- Green onions, for garnish: Add freshness, color, and a loaded baked potato finish.
How to Make Mashed Potato Casserole
POTATOES. Peel and cube 5 pounds of potatoes. Place in a large pot and add water until just covering potatoes. Bring to boil. Once boiling, reduce to a simmer and cook for 18-20 minutes.
MASH. Drain water and mash potatoes using a potato masher or spoon (do not over-mix or potatoes will become gummy). Add 1 cup sour cream, ½ cup butter, 8 ounces cream cheese, and ½ cup milk until well combined.
SEASON. Add 1 teaspoon garlic salt, and black pepper to taste. Fold in ½ of the cooked bacon, 1 cup cheddar cheese, and ½ cup parmesan cheese. Stir well.
BAKE. Spoon into a lightly greased 9×13 pan. Top with remaining shredded cheddar cheese and the rest of the bacon. Bake at 350°F for 20-25 minutes.
TOPPINGS. Garnish with green onions or chives.
Kristyn’s Recipe Tips
- Cut the potatoes into similar-size cubes so they cook evenly.
- Drain the potatoes well before mashing so the casserole does not turn watery.
- Add the sour cream, butter, cream cheese, and milk while the potatoes are warm so everything melts together smoothly.
- Save half the bacon and some cheddar for the top so the casserole looks extra delicious.
- Make-ahead tip: assemble the casserole earlier in the day or the day before, cover and refrigerate, then bake when ready, adding extra time if it starts cold.
Mashed Potato Casserole Recipe
Equipment
Video
Ingredients
- 5 pounds potatoes, peeled and cubed
- 1 cup sour cream
- ½ cup butter
- 8 ounces cream cheese, cubed
- ½ cup milk
- 2 teaspoons garlic salt (with parsley flakes)
- pepper to taste
- 12 slices bacon, cooked, chopped, and divided
- 2 cups cheddar cheese, divided
- ½ cup parmesan cheese
- green onions, for garnish
Instructions
- Peel and cube potatoes.
- Place in pot and add water until just covering potatoes. Bring to boil. Once boiling, reduce to a simmer and cook for 18-20 minutes.
- Drain water and mash potatoes using a masher or spoon. Add sour cream, butter, cream cheese, and milk until well combined. Add salt and pepper. Fold in ½ the bacon, 1 cup cheddar cheese, and parmesan cheese. Stir well.
- Spoon into a lightly greased 9×13 pan. Top with remaining cheddar cheese and the rest of the bacon.
- Bake at 350°F for 20-25 minutes. Garnish with green onions and ENJOY!
Notes
- Cut the potatoes into similar-size cubes so they cook evenly.
- Drain the potatoes well before mashing so the casserole does not turn watery.
- Add the sour cream, butter, cream cheese, and milk while the potatoes are warm so everything melts together smoothly.
- Save half the bacon and some cheddar for the top so the casserole looks extra delicious.
- Make-ahead tip: assemble the casserole earlier in the day or the day before, cover and refrigerate, then bake when ready, adding extra time if it starts cold.
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Recipe FAQ
We recommend making this no more than 48 hours in advance, cover and refrigerate. Cook until warmed throughout.
Store leftovers in an airtight container in the fridge for 3-5 days.
To freeze, simply spread them into a freezer Ziploc bag and squeeze out as much air as possible. They’re best when used within 6-8 weeks, but can last for up to 4 months.
Let potatoes thaw in the fridge overnight. Place potatoes in a casserole dish and bake at 350°F for about 25 minutes. Add additional cheese and top and bake for an additional 5 minutes.
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This recipe was first shared October, 2015.
This recipe had me at potato’s since I grew up in the Midwest and potatoes were a staple vThis recipe gives the comfort in food. Delicious, creamy and easy to assemble and make for company or pot luck. My family is excited when they see this as the side dish for dinner. I know everyone will eat it.
I love mashed potatoes and this recipe is a great way to turn regular potatoes into something delicious!
This recipe is incredible to make and eat. Soo good. Leftovers, reheated in the microwave are fantastic, too.
Best mashed potatoes I’ve ever had, even better than mine! Will only be making these for now on
I first made these at Thanksgiving. My picky family loved them so much more than twice baked. I love them because it was less fuss to make. So good.
I made this today for our lunch with my roast beef sandwich. My husband and I love this recipe!!! I enjoy getting your e-mails to see what I can make next. Keep sending those good recipes!!!!
I LOVE a loaded baked potato and this is basically one in a casserole form. YUM!
I love making casseroles. Saves time and they are delicious! My family loves mashed potatoe casserole. I have used many of your recipes since I joined.
I’m so very excited to try this recipe. I love mashed potatoes and the cheese and bacon on this one make it look so yummy instead of just the traditional gravy!
These are the best! I made them for Thanksgiving. Now I’m thinking we should have them again for Easter too!