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Ultimate Loaded Mashed Potato Casserole

A spoonful of cheesy, bacon-topped mashed potato casserole being lifted from a white baking dish.

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Make this creamy, cheesy mashed potato casserole loaded with bacon and green onions. It is a comforting side dish perfect for holidays or family dinners and can be prepared ahead of time.

Ingredients

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  • 3 lbs Russet potatoes, peeled and quartered
  • 1 cup whole milk
  • 8 tablespoons unsalted butter
  • 8 ounces cream cheese, softened
  • 1 cup sour cream
  • 1 cup shredded sharp cheddar cheese, plus 1/2 cup for topping
  • 4 slices bacon, cooked and crumbled
  • 2 green onions, sliced
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper

Instructions

  1. Preheat your oven to 375 degrees Fahrenheit. Lightly grease a 9×13 inch baking dish.
  2. Place the peeled and quartered potatoes in a large pot. Cover with water and add 1 teaspoon of salt. Bring to a boil and cook until the potatoes are fork-tender, about 15 to 20 minutes.
  3. Drain the potatoes well and return them to the hot pot. Let them sit for 2 minutes to allow excess moisture to evaporate.
  4. Add the milk and butter to the potatoes. Mash until smooth.
  5. Add the softened cream cheese, sour cream, 1 cup of cheddar cheese, salt, and pepper. Mix until everything is fully combined and creamy. Do not overmix.
  6. Gently fold in the crumbled bacon and most of the sliced green onions, reserving some for garnish.
  7. Spread the mashed potato mixture evenly into the prepared baking dish.
  8. Sprinkle the remaining 1/2 cup of cheddar cheese over the top.
  9. Bake for 20 to 25 minutes, or until the casserole is heated through and the cheese topping is bubbly and lightly golden.
  10. Remove from the oven, garnish with the remaining green onions, and let it rest for 5 minutes before serving.

Notes

  • To make this a make-ahead dish, assemble the casserole completely, cover it tightly with foil, and refrigerate for up to 2 days. Add 10 to 15 minutes to the baking time if baking directly from the refrigerator.
  • For extra flavor, add 1/2 teaspoon of garlic powder to the potato mixture.
  • You can substitute turkey bacon for regular bacon if desired.

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