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overhead shot of baked mashed potatoes in a white baking dish
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5 from 7 votes

Creamy Baked Mashed Potatoes

These creamy mashed potatoes are seasoned with garlic, onion, and thyme, and filled with melting white cheddar. A topping of the same melted cheese sets them off to perfection!
Prep Time30 mins
Cook Time45 mins
Total Time1 hr 20 mins
Course: Side Dish
Cuisine: American
Keyword: baked mashed potatoes, christmas dinner, easy side dish, mashed potatoes
Servings: 10 servings
Calories: 425kcal


  • 3 pounds russet potatoes, peeled and halved
  • 1/2 cup butter
  • 1 cup sour cream
  • 1/2 cup milk
  • 3 cups shredded white cheddar, plus 1 cup for topping
  • 1 teaspoon salt
  • 1/2 teaspoon cracked black pepper
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • 2 teaspoons dried thyme
  • Fresh chopped chives for garnish


  • Preheat oven to 375°F.
  • In a large pot, add the potatoes and cover with cold water. Bring to a boil and simmer the potatoes until cooked and tender, about 30 minutes.
  • Drain the potatoes and add them back to the pot.
  • To the potatoes, add the butter, sour cream, milk, and white cheddar, and mash over a low heat.
  • Once smooth and creamy, add the salt, pepper, garlic powder, onion powder, and dried thyme.
  • Combine well; taste and adjust accordingly.
    Spoon the mashed potatoes into a greased 9x13-inch oven proof dish.
  • Top with the white cheddar and cover in foil.
  • Bake for 30 minutes, remove foil and continue baking for 15 minutes - or until cheese is golden.
  • Serve warm, topped with chopped chives.


Calories: 425kcal | Carbohydrates: 27g | Protein: 15g | Fat: 29g | Saturated Fat: 18g | Cholesterol: 85mg | Sodium: 625mg | Potassium: 664mg | Fiber: 2g | Sugar: 2g | Vitamin A: 907IU | Vitamin C: 8mg | Calcium: 389mg | Iron: 2mg