Make-Ahead Mashed Potato Casserole Recipe – Easy Holiday Side Dish
This make-ahead mashed potato casserole recipe is the ultimate comfort food. Creamy mashed potatoes are whipped with butter, sour cream, and cheese, then baked until golden and bubbly. Perfect for holidays or busy weeknights, it saves time without sacrificing flavor.
Equipment
- Large pot
- Potato masher or ricer
- Mixing bowl
- Wooden spoon or spatula
- 9x13-inch baking dish
- Foil
Ingredients
- 4 lbs potatoes (Russet or Yukon Gold)
- ½ cup butter, softened
- 8 oz cream cheese, room temperature
- 1 cup sour cream
- 1 cup shredded cheddar cheese (optional topping)
- ½ cup milk (warm)
- 1 tsp salt
- ½ tsp black pepper
- 2 tbsp chopped chives or parsley (for garnish)
- Optional: bacon crumbles, roasted garlic, crispy onions
Instructions
- Boil Potatoes: Peel and cut potatoes into chunks. Place in salted cold water, bring to a boil, and cook until fork-tender (15–20 minutes).
- Mash Potatoes: Drain well. Mash with a masher for rustic texture or use a ricer for smooth consistency.
- Mix Dairy & Seasonings: Stir in butter, cream cheese, sour cream, milk, salt, and pepper until creamy.
- Assemble Casserole: Transfer to a greased baking dish. Smooth the top and sprinkle with cheddar if desired.
- Make-Ahead Option: Cover tightly with foil and refrigerate up to 2 days.
- Bake: When ready, let sit at room temp for 30 minutes. Bake uncovered at 350°F for 30–40 minutes until heated through and golden.
- Serve: Garnish with chives, parsley, or crispy onions.
Notes
- Use a mix of Russet and Yukon Gold for the best balance of fluffy and creamy texture.
- Room-temperature dairy ensures smooth mixing without lumps.
- For a lighter version, substitute Greek yogurt for sour cream.
- Freeze portions for up to 1 month; thaw overnight before baking.
- Reheat leftovers covered with foil to keep moisture in.