Grilled Cheese Burger

Instructions

Step 1 Season the ground beef with salt and pepper, then divide into 4 equal portions and shape into patties./n
Step 2 Heat olive oil in a skillet over medium heat and cook the patties for about 3–4 minutes per side until desired doneness is reached./n
Step 3 In a separate pan, melt 1 tablespoon butter and cook the sliced onions over medium-low heat until caramelized and golden brown, about 15 minutes./n
Step 4 Butter one side of each bread slice and spread a thin layer of mayonnaise on the other side./n
Step 5 Place bread slices butter-side down on a skillet, add a slice of cheddar and Swiss cheese, then top with a cooked beef patty and caramelized onions./n
Step 6 Add another layer of cheese on top of the onions and cover with another slice of bread, butter-side up./n
Step 7 Grill the sandwich over medium heat until the bread is golden brown and the cheese is fully melted, flipping carefully to toast both sides evenly./n
Step 8 Remove from heat, let cool slightly, then slice and serve warm.

Storage and Reheating Tips

Store leftover grilled cheese burgers in an airtight container in the refrigerator for up to 2 days. To reheat, place in a skillet over low heat to maintain crispiness, or warm in an oven at 350°F (175°C) for about 10 minutes. Avoid microwaving as it can make the bread soggy.