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Bacon Cheeseburger Grilled Cheese Casserole

The ultimate comfort food mashup combining two classic favorites - cheeseburgers and grilled cheese - in an easy, family-friendly casserole that's perfect for weeknight dinners.
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Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings: 8 servings
Course: Main-course
Cuisine: American
Calories: 520
Ingredients Method Notes

Ingredients
  

  • Cheeseburger Filling
  • 1 lb lean ground beef
  • 1 cup yellow onion diced
  • 1/2 cup real bacon bits
  • 1/4 cup mayonnaise
  • 1/4 cup ketchup
  • 1 tbsp yellow mustard
  • 1/2 tsp salt
  • 1/2 tsp black pepper
  • 2 tsp onion powder
  • Casserole Assembly
  • 12 slices white or whole wheat bread
  • 1/2 cup margarine or butter softened
  • 4 cups shredded mozzarella and cheddar cheese blend

Method
 

  1. Preheat and Prepare
  2. Preheat your oven to 400°F and grease a 9x13 inch baking dish. This temperature ensures your casserole gets that perfect golden crust while heating through completely. A well-greased dish prevents sticking and makes serving much easier.
  3. Brown the Beef
  4. Heat a large skillet over medium-high heat and add the ground beef with a small dab of butter. Cook the beef, breaking it up into small crumbles as it browns for about 6-8 minutes. The butter helps the beef develop a slightly richer flavor while browning evenly.
  5. Cook the Onions
  6. Once the beef is cooked through, drain any excess grease. Add the diced onions to the pan and cook for another 3-4 minutes, stirring occasionally, until the onions start to soften and become translucent. This step adds sweetness and depth to the filling.
  7. Mix the Cheeseburger Filling
  8. Remove the pan from heat and stir in the bacon bits, mayo, ketchup, mustard, salt, pepper, and onion powder. Mix everything together until well combined. This combination of condiments and seasonings perfectly recreates the classic cheeseburger flavor profile that makes this dish so satisfying.
  9. Create the Bottom Layer
  10. Spread 6 slices of bread with half the margarine, then cut each slice in half. Place these pieces margarine-side down in your greased baking dish, creating the bottom layer. Sprinkle 2 cups of the cheese mixture over the bread. The margarine helps the bread develop a crispy, golden texture like a traditional grilled cheese.
  11. Add Filling and Cheese
  12. Spoon the beef mixture evenly over the cheese layer, spreading it out to cover the bread completely. Top with the remaining 2 cups of cheese. This layering method ensures every bite contains the perfect balance of bread, meat, and cheese.
  13. Add the Top Layer and Bake
  14. Spread the remaining 6 slices of bread with the rest of the margarine and cut them in half. Place these pieces margarine-side up on top of the casserole. Bake for 20-24 minutes until the top is golden brown and crispy. The exposed margarine helps the top layer achieve that beautiful grilled cheese color and texture.
  15. Rest and Serve
  16. Let the casserole rest for about 5 minutes before cutting. This brief resting period allows the layers to set slightly, making it easier to portion and serve. Cut into squares and serve hot.

Notes

  • For extra flavor, try adding diced pickles to the beef mixture or serving pickle spears on the side.
  • You can substitute turkey bacon or plant-based bacon bits for a lighter version.
  • This casserole reheats well in the oven at 350°F for about 10-15 minutes if you have leftovers.
  • For a spicy variation, add sliced jalapeños or a dash of hot sauce to the beef mixture.
  • Try using garlic butter instead of regular butter for an extra flavor dimension.