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The Perfect Loaded Mashed Potato and Meatball Casserole Recipe

This hearty casserole brings together oven-baked meatballs simmered in a simple marinara, finished with melted mozzarella, all nestled into rich, fully loaded mashed potatoes. It’s a comforting, all-in-one dinner that’s big on flavor and perfect for sharing.
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Course: Dinner, Main Course
Cuisine: American
Keyword: The Perfect Loaded Mashed Potato and Meatball Casserole Recipe
Prep Time: 25 minutes
Cook Time: 1 hour
Total Time: 1 hour 25 minutes
Servings: 12
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Ingredients

For the Meatballs
  • 1 pound lean ground beef
  • 1 pound ground turkey
  • ½ cup bread crumbs
  • ½ cup diced onion
  • 2 large eggs
  • 1 teaspoon salt
  • 1 teaspoon pepper
  • 3 cloves fresh garlic, minced
  • ¼ cup fresh parsley, minced
  • ⅓ cup grated parmesan cheese
For the Loaded Mashed Potatoes
  • 3 cups mashed potatoes, about 5 potatoes, if using homemade
  • 1 tablespoon fresh parsley, minced
  • 6 slices turkey bacon, cooked and chopped
  • 1 teaspoon garlic, minced
  • 2 large eggs
  • ½ cup shredded cheddar cheese
  • 1 teaspoon salt
  • ½ teaspoon pepper
For the Marinara Sauce
  • 2 teaspoons olive oil
  • ¼ cup onion, diced
  • 2 cloves garlic, minced
  • 2 cups tomato sauce
  • 4 large basil leaves, minced (or 1 tablespoon dried basil)
  • ½ teaspoon salt
  • ¼ teaspoon sugar
  • ¼ teaspoon pepper
  • ¼ teaspoon thyme
  • ¼ teaspoon oregano
For the Topping
  • 2 slices mozzarella cheese

Instructions

Make the Meatballs
  1. Heat the oven to 350°F. Prepare a cookie sheet or cake pan with nonstick cooking spray or parchment paper.
  2. Add all meatball ingredients to a large bowl and mix until evenly combined.
  3. Use a large ice cream scoop to portion the mixture into 12 equal amounts, rolling each into a ball.
  4. Arrange the meatballs on the prepared pan and bake for 28–30 minutes, until fully cooked.
  5. Remove from the oven and set aside.
Make the Loaded Mashed Potatoes
  1. Coat a 9×13 baking dish with nonstick spray and set it aside.
  2. In a large bowl, stir together all of the mashed potato ingredients until well mixed.
  3. With a large ice cream scoop, portion the mixture into 12 large scoops and arrange them in the baking dish in rows of three.
  4. Using a spoon or small scoop, press a shallow well into the center of each potato mound.
  5. Place one cooked meatball into each indentation on top of the potatoes.
Make the Marinara Sauce
  1. Warm the olive oil in a large saucepan over medium heat. Add the diced onion and cook for about 5 minutes, until softened.
  2. Stir in the garlic and cook for another 60 seconds.
  3. Pour in the tomato sauce and mix well. Add the basil and let the sauce simmer for 10 minutes.
  4. Season with salt, sugar, pepper, thyme, and oregano, then continue cooking for 5 more minutes.
Assemble and Bake
  1. Spoon marinara sauce over each meatball and top each one with a slice of mozzarella cheese.
  2. Place the dish in the oven and bake for 10 minutes.
  3. Switch the oven to broil at 500°F and move the pan to the top rack. Broil for 3–5 minutes, until the cheese is lightly browned. Note: Broiling is safest in metal baking pans. Glass and ceramic pans may crack under high heat.
  4. Remove from the oven and serve with bread or your favorite side dish.
 
Notes
  • Storage: Transfer leftovers to an airtight container and refrigerate for up to 5 days.
Nutrition
Calories: 766 | Carbohydrates: 36g | Protein: 49g | Fat: 47g | Saturated Fat: 20g | Polyunsaturated Fat: 23g | Trans Fat: 1g | Cholesterol: 266mg | Sodium: 2502mg | Fiber: 4g | Sugar: 7g
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