Cheesy Mashed Potato Casserole with Bacon and Green Onions

Take your mashed potatoes to the next level with this Cheesy Mashed Potato Casserole. Creamy, cheesy, and topped with crispy bacon and fresh green onions, this dish is a comforting crowd-pleaser. Perfect as a side for holiday feasts or a cozy family dinner, it’s simple to make and packed with flavor. Prepare it ahead of time for stress-free entertaining!

Ingredients

Potatoes:

  • 1.75 kg / 3.5 lbs potatoes (Sebago, Russet, Maris Piper, or King Edwards)
  • 1 tbsp kosher salt (for cooking potatoes)

Mash:

  • 2/3 cup milk (whole preferred; lite okay)
  • 2/3 cup extra milk (for make-ahead option only)
  • 75 g / 5 tbsp unsalted butter, cubed
  • 1/2 cup sour cream (or yogurt, full fat preferred)
  • 1 tsp kosher salt (or to taste)

Cheese:

  • 1 1/2 cups mozzarella cheese, freshly shredded
  • 1 cup Red Leicester, cheddar, or other flavored cheese, shredded

Topping:

  • 200 g / 6 oz streaky bacon, chopped
  • 1/4 cup green onions, finely sliced

Instructions

  1. Cook the Potatoes : Peel and cut the potatoes into chunks. Place them in a large pot of water with 1 tablespoon of salt. Bring to a boil and cook until the potatoes are fork-tender (about 15–20 minutes). Drain well.
  2. Prepare the Mash : Return the drained potatoes to the pot. Add the butter, milk, sour cream, and 1 teaspoon of kosher salt. Mash until smooth and creamy. Adjust salt to taste.
  3. Incorporate the Cheese : Stir 1 cup of mozzarella and 1/2 cup of Red Leicester or cheddar into the mashed potatoes, mixing until evenly combined.
  4. Assemble the Casserole : Preheat your oven to 375°F (190°C). Spread the mashed potato mixture evenly into a greased 9×13-inch casserole dish. Sprinkle the remaining mozzarella and Red Leicester/cheddar cheese on top.
  5. Cook the Bacon : In a skillet over medium heat, cook the chopped bacon until crispy. Drain on paper towels.
  6. Add Bacon and Green Onions : Sprinkle the cooked bacon and green onions over the top of the cheese layer.
  7. Bake the Casserole : Bake the casserole in the preheated oven for 20–25 minutes, or until the cheese is bubbly and golden.
  8. Serve and Enjoy : Let the casserole cool slightly before serving. Pair it with your favorite main dish for a satisfying meal.

Conclusion

This Cheesy Mashed Potato Casserole with Bacon and Green Onions is a decadent twist on a classic favorite. The creamy potatoes, gooey cheese, and crispy bacon create an irresistible combination that’s sure to impress. Whether for a holiday spread or a weeknight dinner, this dish is comfort food at its finest.

Cheesy Mashed Potato Casserole with Bacon and Green Onions

A rich, creamy mashed potato casserole loaded withcheese, crispy bacon, and green onions. Perfect for special occasions or anytime you want a comforting side dish.
Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Course Main Course
Cuisine American-inspired
Servings 8
Calories 351 kcal

Ingredients
  

Potatoes:

  • 1.75 kg / 3.5 lbs potatoes Sebago, Russet, Maris Piper, or King Edwards
  • 1 tbsp kosher salt for cooking potatoes

Mash:

  • 2/3 cup milk whole preferred; lite okay
  • 2/3 cup extra milk for make-ahead option only
  • 75 g / 5 tbsp unsalted butter cubed
  • 1/2 cup sour cream or yogurt, full fat preferred
  • 1 tsp kosher salt or to taste

Cheese:

  • 1 1/2 cups mozzarella cheese freshly shredded
  • 1 cup Red Leicester cheddar, or other flavored cheese, shredded

Topping:

  • 200 g / 6 oz streaky bacon chopped
  • 1/4 cup green onions finely sliced

Instructions
 

  • Cook the Potatoes : Peel and cut the potatoes into chunks. Place them in a large pot of water with 1 tablespoon of salt. Bring to a boil and cook until the potatoes are fork-tender (about 15–20 minutes). Drain well.
  • Prepare the Mash : Return the drained potatoes to the pot. Add the butter, milk, sour cream, and 1 teaspoon of kosher salt. Mash until smooth and creamy. Adjust salt to taste.
  • Incorporate the Cheese : Stir 1 cup of mozzarella and 1/2 cup of Red Leicester or cheddar into the mashed potatoes, mixing until evenly combined.
  • Assemble the Casserole : Preheat your oven to 375°F (190°C). Spread the mashed potato mixture evenly into a greased 9×13-inch casserole dish. Sprinkle the remaining mozzarella and Red Leicester/cheddar cheese on top.
  • Cook the Bacon : In a skillet over medium heat, cook the chopped bacon until crispy. Drain on paper towels.
  • Add Bacon and Green Onions : Sprinkle the cooked bacon and green onions over the top of the cheese layer.
  • Bake the Casserole : Bake the casserole in the preheated oven for 20–25 minutes, or until the cheese is bubbly and golden.
  • Serve and Enjoy : Let the casserole cool slightly before serving. Pair it with your favorite main dish for a satisfying meal.
Keyword Mashed potato casserole

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