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Bacon and Caramelized Onion Grilled Cheese Sandwiches

Golden-brown grilled cheese sandwiches loaded with crispy bacon, sweet caramelized onions, and gooey melted cheese for the ultimate comfort food experience.
Print Recipe
Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 4 sandwiches
Course: Dinner, Lunch
Cuisine: American, Comfort Food
Calories: 580
Ingredients Equipment Method Notes

Ingredients
  

Caramelized Onions
  • 2 large yellow onions thinly sliced
  • 2 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1 tbsp granulated sugar
  • salt and pepper to taste
Sandwiches
  • 8 slices thick white bread
  • 8 strips bacon
  • 2 cups shredded mozzarella cheese
  • 1 cup shredded cheddar cheese
  • 4 tbsp unsalted butter softened
  • 2 tbsp mayonnaise optional
  • fresh parsley for garnish

Equipment

  • Large Skillet
  • Mixing bowls
  • Spatula
  • Cheese grater

Method
 

  1. Cook bacon in a large skillet over medium heat until crispy, about 8-10 minutes. Remove to paper towel-lined plate and set aside.
  2. In the same skillet, add butter and olive oil over medium-low heat. Add sliced onions and stir to coat.
  3. Sprinkle sugar over onions, season with salt and pepper, and cook slowly for 25-40 minutes, stirring occasionally, until deeply caramelized and golden brown.
  4. Combine shredded mozzarella and cheddar cheese in a bowl and set aside.
  5. Mix softened butter with mayonnaise if using. Spread mixture on one side of each bread slice.
  6. On unbuttered side of 4 bread slices, layer cheese mixture, crumbled bacon, caramelized onions, and more cheese. Top with remaining bread slices, buttered side out.
  7. Heat skillet over medium-low heat. Place sandwiches in skillet and cook 3-4 minutes per side until golden brown and cheese is melted.
  8. Remove from heat, let rest 1-2 minutes, cut in half diagonally, garnish with fresh parsley if desired, and serve immediately.

Notes

Caramelized onions can be made up to 3 days in advance. For extra flavor, add fig jam or hot honey. Store leftovers wrapped in foil in refrigerator for up to 2 days.