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Easy Cheesy Mashed Potatoes Casserole side dish recipe | lecremedelacrumb.com

Cheesy Mashed Potatoes Casserole

This Cheesy Mashed Potatoes Casserole will make every other potato casserole you’ve ever made look like just plain old boring potatoes. Stuffed full of delicious mashed potatoes, cream cheese, shredded cheese, sour cream, and garlic, this casserole is even in-law approved! 
Course Side Dish
Cuisine American
Prep Time 10 minutes
Cook Time 25 minutes
0 minutes
Total Time 35 minutes
Servings 8 servings
Calories 284kcal
Author Tiffany


  • 6 cups prepared mashed potatoes OR 6 large russet potatoes, peeled and chopped
  • 8 ounces cream cheese softened, reduced fat is okay
  • 1 ½ cup shredded cheddar or monterey jack cheese, divided
  • ½ cup sour cream reduced fat is okay
  • 1 teaspoon onion powder
  • 1 teaspoon garlic powder (omit if using prepared garlic mashed potatoes)
  • 2 teaspoons salt
  • ½ teaspoon black pepper


  • Preheat oven to 350 degrees and grease a 2-quart baking dish.
  • If using prepared mashed potatoes, move ahead to step 3. If using russet potatoes, place potatoes in a large pot, cover with water, cover the pot and bring to a boil. Cook for 20-25 minutes until potatoes are very tender, drain the pot. Transfer potatoes to a large bowl and mash until smooth.
  • Combine potatoes with cream cheese, sour cream, half cup shredded cheese, onion powder, garlic powder (if using), salt, and pepper and mash/mix everything til combined and smooth.
  • Spoon potatoes into prepared baking dish. Top with remaining cheese.
  • Cover the baking dish and cook for 35-40 minutes. Switch to BROIL for 3-5 minutes longer (watch closely so the cheese doesn't burn). Allow to cool slightly before serving.


Be cautious not to over-mix your potatoes, this will lead to gluey potatoes. 


Calories: 284kcal | Carbohydrates: 30g | Protein: 10g | Fat: 14g | Saturated Fat: 8g | Cholesterol: 43mg | Sodium: 823mg | Potassium: 741mg | Fiber: 4g | Sugar: 3g | Vitamin A: 518IU | Vitamin C: 31mg | Calcium: 152mg | Iron: 1mg