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–+ servings
Creamy baked potato casserole topped with bacon and green onions.

Mashed Potato Casserole

Smiling woman with glasses and dark hair, professional portrait for Baked Bree website.Diane Goodman
5 from 1 vote
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Prep Time 20 minutes
Cook Time 1 hour 20 minutes
Total Time 1 hour 40 minutes
Course Side Dish
Cuisine American
Servings 10
Calories 351 kcal

Ingredients
  

  • 3.5 lbs Russet potatoes peeled and quartered
  • 1 tbsp kosher salt plus more to taste
  • 1 1/3 cups whole milk divided
  • 5 tbsp unsalted butter cut into cubes
  • 1/2 cup full-fat sour cream
  • 1 1/2 cups mozzarella cheese freshly shredded
  • 1 cup sharp cheddar cheese freshly shredded
  • 6 oz bacon chopped
  • 1/4 cup green onions finely sliced

Instructions
 

  • Start by placing your peeled and quartered potatoes in a large pot. Cover them with cold water, add 1 tablespoon of kosher salt, and bring to a boil. Cook until the potatoes are fork-tender, about 15-20 minutes.
    Potatoes soaking in water for baking or cooking.
  • Drain the potatoes and return them to the pot. Add 2/3 cup of milk and the cubed butter. Mash the potatoes until smooth and creamy. Stir in the sour cream and additional salt to taste.
    Butter and potato mashed in stainless steel mixing bowl with hand mixer, on white surface.
  • Preheat your oven to 375°F. Fold in 1 cup of the mozzarella and half of the cheddar cheese into the mashed potatoes until well combined. If you're preparing this ahead of time, stir in the extra 2/3 cup of milk to keep the potatoes moist during reheating.
    Shredded cheddar and Monterey Jack cheese layered on mashed potatoes in a stainless steel baking dish.
  • In a skillet, cook the chopped bacon until crispy. Drain on paper towels. Spread half of the mashed potatoes into a greased 9x13-inch baking dish. Sprinkle with half of the cooked bacon and the remaining cheese. Top with the rest of the mashed potatoes, smoothing the top with a spatula.
    Crispy baked potato with shredded cheese and bacon bits, topped with cheddar and mozzarella, on a white plate.
  • Sprinkle the remaining bacon and a touch more cheese on top for a crispy, golden crust. Bake for 25 minutes, or until the cheese is bubbly and golden brown.
    Creamy mashed potatoes with crispy bacon bits in a white bowl on a white surface.
  • Let the casserole sit for a few minutes after baking. Sprinkle with green onions before serving for a pop of color and freshness.
    Cheesy potato casserole with bacon and green onions, baked to golden perfection.

Nutrition

Calories: 351kcalCarbohydrates: 33gProtein: 13gFat: 19gSaturated Fat: 9gSodium: 1147mgFiber: 3g
Keyword Easy Mashed Potato Casserole
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