Creamy Baked Mashed Potatoes Recipe for Ultimate Comfort

These Creamy Baked Mashed Potatoes are a classic holiday side, rich, comforting, and full of flavor. Seasoned with thyme and finished with plenty of melty white cheddar, this casserole elevates plain mashed potatoes into something special.

The Easiest Way to Make Mashed Potatoes

Making great mashed potatoes is simpler than you might think. This recipe focuses on creamy texture and bold, balanced flavor. It’s easy enough for a weeknight and impressive enough for holidays.

Why I Love this Recipe

It’s all about the flavor. Sour cream, chives, garlic and onion powders, thyme, and a generous amount of white cheddar combine to make rich, savory mashed potatoes with comforting depth. The cheddar melts into the mash and crisps on top in the oven for the perfect finish.

Recipe Ingredients

• Potatoes: 3 pounds russet potatoes, peeled and halved. Russets give a fluffy, smooth texture; waxy potatoes will work but may be firmer.
• Butter: 1/2 cup (1 stick). Unsalted butter lets you better control seasoning; if using salted, reduce added salt.
• Sour Cream: 1 cup, for extra creaminess and tang.
• Milk: 1/2 cup, or more as needed to reach desired consistency. Any milk works; dairy alternatives will change flavor slightly.
• Shredded White Cheddar: 4 cups total — 3 cups mixed into the potatoes and 1 cup for the topping. Regular cheddar is fine as a swap.
• Salt and Pepper to taste.
• Garlic Powder, Onion Powder, and Thyme: 1 teaspoon garlic powder, 1 teaspoon onion powder, and 2 teaspoons dried thyme add aromatics and depth.
• Fresh Chives: Chopped, for garnish.

How to Make Baked Mashed Potatoes

1. Preheat the oven. Set oven to 375°F.
2. Boil the potatoes. Place peeled, halved potatoes in a large pot and cover with cold water. Bring to a boil, then simmer until tender, about 30 minutes. Drain well and return to the pot.
3. Mash and season. Add butter, sour cream, milk, and 3 cups of shredded white cheddar to the potatoes. Mash over low heat until smooth and creamy. Stir in salt, cracked black pepper, garlic powder, onion powder, and dried thyme. Taste and adjust seasoning.
4. Assemble and bake. Spoon the mashed potatoes into a greased 9×13-inch ovenproof dish. Sprinkle the remaining 1 cup of cheddar evenly on top. Cover with foil and bake 30 minutes. Remove foil and bake an additional 15 minutes, or until cheese is golden and bubbly.
5. Serve. Garnish with chopped fresh chives and serve warm.

Tips for Success

• Season gradually. Dairy and cheese can add salt, so season carefully and taste as you go.
• Soaking potatoes. A brief 5-minute soak of peeled, cut potatoes in cold water can remove extra starch and reduce stickiness, but it’s optional.
• Use broth for extra flavor. Cooking potatoes in chicken or vegetable broth instead of water adds a subtle, savory boost.

Can Baked Mashed Potatoes Be Made in Advance?

• Yes. Prepare the mashed potato mixture, place it in the casserole dish, cover, and refrigerate for up to 24 hours. When ready, top with remaining cheese and bake as directed.

How to Store and Reheat Leftovers

• Refrigerate leftovers in airtight containers for up to 3 days.
• To freeze, portion cooled mashed potatoes into freezer bags, remove excess air, and freeze up to one month.
• To reheat, place potatoes in an ovenproof dish, cover, and bake at 350°F until heated through. You can add a splash of milk to refresh the texture if needed.

Serving Suggestions

• Turkey: Classic roasted turkey pairs beautifully with creamy, cheesy potatoes.
• Brussels Sprouts: Roasted or sautéed Brussels sprouts add a bright, slightly bitter contrast to the rich casserole.
• Something sweet: Finish the meal with a seasonal dessert such as pumpkin bars or similar treats to balance the savory main courses.