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white bowl of mashed potato casserole topped with cheese, bacon, and green onions
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4.92 from 12 votes

Loaded Mashed Potato Casserole

This must-make side dish is made with irresistibly creamy mashed potatoes, and loaded up with sour cream, cheddar cheese, crispy bacon, and fresh green onions!
Prep Time40 minutes
Cook Time30 minutes
Total Time1 hour 10 minutes
Course: Side Dish
Cuisine: American
Keyword: potato side dish
Servings: 8 servings
Calories: 735kcal
Author: The Chunky Chef

Ingredients

  • 4 lbs russet potatoes peeled
  • 4 cloves garlic smashed
  • 1/4 cup unsalted butter softened to room temperature
  • 1 cup sour cream
  • 2/3 cup heavy cream warmed
  • 2 oz cream cheese softened to room temperature
  • 3/4 tsp kosher salt
  • 1/2 tsp black pepper
  • 3 cups shredded sharp cheddar cheese (divided)
  • 6 green onions chopped (divided)
  • 12 oz pkg bacon cooked and crumbled (divided)

Instructions

Prepare

  • Preheat oven to 375°F and set out a 9x13" (or 3 quart) baking dish. Butter the dish, and set aside.

Boil potatoes and garlic

  • Slice potatoes into 1.5” pieces, then add to a large pot with the smashed garlic cloves.
  • Cover with water by about 1 inch, then bring to a boil.  Boil for about 15-20 minutes, or until the potatoes can be easily pierced with a fork.

Drain

  • Drain potatoes well, then add back to the same hot pot you cooked them in. Let them sit about a minute (this allows any excess water to evaporate).

Mix

  • Add potatoes to a large mixing bowl.  Mash about halfway with a potato masher (or you can use a potato ricer).
  • Add butter, sour cream, warmed cream, and cream cheese.  Stir and mash until potatoes are smooth and fluffy.  Season with salt and pepper, and stir to combine.
  • Stir 2 cups of cheddar cheese, half the bacon, and half the green onions into the mashed potatoes. 

Assemble

  • Transfer mixture to prepared baking dish.  Top with remaining 1 cup of cheese, and remaining bacon.

Bake

  • Transfer to the oven and bake, uncovered, for 25-30 minutes, until cheese is melted and potatoes are hot.

Serve

  • Sprinkle with remaining 3 chopped green onions and serve hot.

Notes

  1. I've estimated this recipe serves approximately 8-10 people, but the exact serving size is up to you.

Nutrition

Calories: 735kcal | Carbohydrates: 46g | Protein: 22g | Fat: 52g | Saturated Fat: 26g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 16g | Trans Fat: 0.3g | Cholesterol: 132mg | Sodium: 827mg | Potassium: 1161mg | Fiber: 3g | Sugar: 4g | Vitamin A: 1276IU | Vitamin C: 15mg | Calcium: 392mg | Iron: 2mg