These patty melts are quick to put together, and are better than a diner because they’re not nearly as greasy!
Heat butter and oil in a Dutch oven. Add onions, season with salt and pepper, cook, stirring continually, for 3 minutes. Cover with a lid and allow onions to caramelize, stirring occasionally to prevent burning, about 20 minutes.
Meanwhile, combine ground beef, garlic salt, and pepper in a bowl and mix thoroughly. Shape ground beef into 4 rectangular patties.
Cook patties in a skillet over medium-high heat, flipping once, 3 to 4 minutes per side. Add a slice of Swiss cheese to each patty and top each with an equal amount of caramelized onions.
Set an oven rack about 6 inches from the heat source and preheat the oven’s broiler.
Spread 1 teaspoon butter over each slice of bread. Broil until lightly golden and toasted. Assemble patty melts and serve immediately.
Per Serving: 677 calories; protein 33.6g; carbohydrates 43.4g; fat 41g; cholesterol 133.8mg; sodium 1639.7mg.