Mashed Potato Casserole

If you’re looking for a side dish that’s easy, comforting, and guaranteed to be a hit, Mashed Potato Casserole is the way to go. This creamy, cheesy casserole is perfect for holidays, family dinners, or any time you want to serve up something special without a lot of fuss. And since you can make it ahead, you’ll have more time to relax and enjoy with your loved ones!

Mashed potatoes are a staple at all our holiday meals. I thought I’d try something a little different this year and make a yummy Mashed Potato Casserole. I think I might even like it better! Each bite is full of delicious flavor and creaminess. I love the melty cheese on top. It’s the ultimate comfort food.

I like mashed potatoes, but I don’t love them. This recipe, though? I’d put it in the love department. It’s a keeper and one I’ll make again and again. 

It’s fairly straightforward to make. If you are making mashed potatoes, take a few extra steps and make this easy casserole recipe. You can thank me later.

Why You’ll Love This Recipe

• So Customizable: Toss in your favorite ingredients to make it your own.
• Perfect for Any Crowd: This casserole’s rich, cheesy goodness is sure to have everyone coming back for seconds.
• Easy to Make: Just a few simple steps turn basic mashed potatoes into something special!

Ingredients

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The full printable recipe card with measurements and instructions is found at the bottom of the post.

• Potatoes: Peel and halve them to get them ready for mashing.
• Eggs: Helps hold the casserole together.
• Cheddar Cheese: Shredded for that perfect, gooey cheesy topping.
• Cream Cheese: Adds a creamy, rich texture.
• Sour Cream: Gives a little tang that balances the richness.
• Salt & Pepper: For seasoning and a bit of spice.
• Unsalted Butter: Adds richness and flavor.
• Green Onions: Sprinkle on top for a pop of color and extra flavor.

How to Make Mashed Potato Casserole

Follow along to learn how to make mashed potato casserole!

• Step One: Preheat oven to 325°F.
• Step Two: Boil the potatoes on the stovetop for 10 minutes or until tender. Add salt, pepper, and butter. Add eggs, cream cheese, and sour cream and mash to combine.

• Step Three: Pour into a greased 9×13 inch casserole dish and sprinkle with cheese.
• Step Four: Bake for 50 minutes. Top with green onions if desired.

Serving Suggestions

Here are some tasty ideas for what to serve with your casserole:

• Proteins: Try it with grilled chicken, turkey, roast beef, or even baked salmon. For a veggie option, sautéed mushrooms or grilled tofu work great, too.
• Veggies: Roasted or steamed veggies like broccoli, green beans, or carrots add color and freshness to your dish.
• Bread: Garlic bread, dinner rolls, or baguette slices add the perfect bit of crunch alongside the creamy casserole.

Variations and Substitutions

• Cheese Swap: For extra flavor, try mozzarella, Parmesan, or even a blend of Gouda and blue cheese.
• Add Veggies: Sautéed mushrooms, bell peppers, caramelized onions, or roasted garlic add great flavor.
• Make it Meaty: Add crispy bacon, diced ham, shredded chicken, or ground beef for a heartier dish. Want a Mexican twist? Try seasoned ground beef or shredded chicken with jalapeños or salsa on top!
• Butter: Use margarine or olive oil to cut down on fat.
• Sour Cream: Swap for Greek yogurt or a dairy-free option like coconut cream.

Storage Instructions

To store, let the casserole cool, then cover it and keep it in the fridge for up to 3-4 days. If you need to keep it longer, freeze it for up to 3 months.

Make-Ahead Tips

Mashed potato casserole is easy to prep in advance, making it perfect for busy days:

• In the Fridge: Make it a day ahead, cover, and refrigerate. When ready to bake, let it sit at room temperature for about 30 minutes before popping it in the oven.
• In the Freezer: Prepare it and wrap it tightly in plastic wrap and foil. Thaw overnight in the fridge, let it come to room temp, and bake as usual.

Choosing the Best Potatoes

• Russet Potatoes – High starch, fluffy, and mild-flavored, ideal for classic mashed potatoes.
• Yukon Gold Potatoes – Creamy, buttery, and slightly sweet, perfect if you want a richer casserole.

For even cooking, choose potatoes that are similar in size, and avoid any with sprouts or green spots.

Common Mistakes to Avoid

• Overworking the Potatoes: Mash gently, or you risk a gluey texture. For best results, use a manual masher rather than an electric mixer.
• Using the Wrong Dish: A too-small or shallow dish can cause overflow or drying out. Choose an ovenproof dish big enough for your mixture.
• Skipping the Butter: Real butter gives the best flavor, so stick to unsalted butter for the richest taste.

Potato Recipes

• Parmesan Thyme Roasted Potatoes
• Lemon Roasted Potatoes
• Olive Oil Mashed Potatoes with Kale and Herbs
• Twice Baked Potato Casserole
• Loaded Mashed Potatoes
• Party Potatoes
• Loaded Baked Potato Soup
• German Potato Soup
• Irish Potatoes
• French Fry Casserole
• Smothered Potatoes

You might also like Cabbage Roll Casserole, Sweet Potato Casserole and Cheesy Corn Casserole.

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