Why You’ll Love Mashed Potato Casserole Recipe
This casserole is smooth, flavorful, and easy to serve to a crowd. The cream cheese and sour cream make the potatoes extra creamy, while garlic and thyme add a savory homemade flavor. It is also great for preparing ahead of time, which makes dinner planning much easier.
Ingredients
(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)
4 lb russet potato, peeled and cubed
1 tbsp salt
8 oz brick cream cheese, softened
1/2 cup butter, softened
1 cup sour cream
1 cup milk
3 cloves garlic, minced
1 tsp salt
1/2 tsp pepper
1 tsp thyme
2 tbsp butter, cubed into small chunks
Directions
Preheat the oven to 375°F.
Fill a large Dutch oven with water and add 1 tablespoon of salt. Bring the water to a boil, then add the cubed potatoes. Boil until the potatoes are fork-tender and beginning to break apart.
Drain the potatoes well, then return them to the pot.
Add the cream cheese, softened butter, sour cream, milk, garlic, salt, pepper, and thyme. Mash everything together with a potato masher until the mixture is mostly smooth with very few chunks remaining.
Transfer the mashed potatoes to a 9×13 casserole dish. Scatter the small butter cubes evenly over the top.
Bake for 60 minutes. Let the casserole rest for at least 30 minutes before serving so it can set properly.
Servings and timing
Servings: 12
Prep time: 40 minutes
Cook time: 60 minutes
Total time: 1 hour 40 minutes
Resting time: 30 minutes
Variations
Add shredded cheddar cheese on top before baking for a cheesy version.
Mix in cooked crumbled bacon for a loaded mashed potato casserole.
Stir in chopped green onions or chives for a fresh flavor.
Use roasted garlic instead of minced garlic for a sweeter, deeper garlic taste.
Add a sprinkle of Parmesan cheese to the top for a savory crust.
Storage/Reheating
Store leftovers in an airtight container in the refrigerator for up to 4 days.
To reheat, cover the casserole with foil and warm it in a 350°F oven until heated through. Individual portions can also be reheated in the microwave.
For best texture, add a small splash of milk before reheating if the potatoes seem dry.
FAQs
Can I make Mashed Potato Casserole ahead of time?
Yes. Prepare the casserole, cover it, and refrigerate it before baking. Bake when ready to serve.
Can I use Yukon gold potatoes instead of russet potatoes?
Yes. Yukon gold potatoes will make the casserole slightly creamier and more buttery in flavor.
Do I have to peel the potatoes?
Peeling gives the smoothest texture, but you can leave some skins on for a more rustic casserole.
Can I add cheese to this casserole?
Yes. Cheddar, mozzarella, Parmesan, or a cheese blend all work well.
Why does the casserole need to rest before serving?
Resting helps the casserole firm up, making it easier to scoop and serve.
Can I freeze Mashed Potato Casserole?
Yes, but the texture may change slightly. Freeze tightly covered, then thaw in the refrigerator before reheating.
Can I make this without cream cheese?
Yes, but the casserole will be less rich. You can replace it with extra sour cream or a little more butter and milk.
How do I keep mashed potatoes from being gluey?
Do not overmix the potatoes. Mash them gently until mostly smooth.
Can I use garlic powder instead of fresh garlic?
Yes. Use about 1 teaspoon of garlic powder in place of the minced garlic.
What main dishes go well with this casserole?
It pairs well with roasted chicken, turkey, ham, meatloaf, beef roast, or grilled vegetables.
Conclusion
Mashed Potato Casserole is a rich, creamy, and comforting side dish that is perfect for feeding a crowd. With simple ingredients and make-ahead convenience, it is a reliable recipe for holidays, gatherings, or cozy family dinners.
