Easy Cheesy Mashed Potato Casserole with Instant Potatoes
This Easy Cheesy Mashed Potato Casserole is creamy, cheesy, and packed with flavor. Made with instant mashed potatoes, sour cream, and plenty of cheese, it’s the perfect shortcut side dish for holidays, potlucks, or busy weeknights.
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Servings: 8 servings
Calories: 223kcal
Ingredients
- 1 ⅓ cup instant mashed potato flakes
- 1 ½ cups water
- ¾ cup milk
- 2 Tbsp butter
- ½ tsp salt
- ½ cup sour cream
- 4 oz cream cheese, softened
- 1 ½ cups shredded cheddar cheese, divided
- ½ tsp garlic powder
- ¼ tsp black pepper
Optional toppings:
- 4 slices cooked bacon, crumbled
- 2 Tbsp chopped green onions
Directions
- Preheat oven to 375°F and grease a 9×9 or small casserole dish.
- In a medium bowl, heat the water, butter, and milk until hot and just starting to boil (you can do this on the stove or in the microwave). Stir in the instant mashed potato flakes and let sit for 1–2 minutes, then fluff with a fork.
- Add the sour cream, cream cheese, 1 cup of the shredded cheddar cheese, garlic powder, salt, and pepper. Stir until smooth and creamy.
- Spread the mashed potato mixture evenly into the prepared baking dish. Sprinkle the remaining ½ cup cheddar cheese over the top.
- Bake uncovered for 20–25 minutes, until hot and bubbly and the cheese is melted.
- Top with crumbled bacon and green onions if desired before serving.
Notes
- You can use plain Greek yogurt in place of sour cream.
- Add a little extra milk if the mixture feels too thick.
- This recipe doubles easily for a 9x13 dish.
Nutrition Facts
Calories: 223 kcal | Carbohydrates: 3 g | Protein: 8 g | Fat: 20 g | Saturated Fat: 10 g | Polyunsaturated Fat: 2 g | Monounsaturated Fat: 6 g | Trans Fat: 0.01 g | Cholesterol: 51 mg | Sodium: 444 mg | Potassium: 112 mg | Fiber: 0.03 g | Sugar: 2 g | Vitamin A: 656 IU | Vitamin C: 0.1 mg | Calcium: 210 mg | Iron: 0.1 mg
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