Diner-Style Patty Melt

Ingredients

• tablespoon sunsalted butter
• tablespoon olive oil
• large yellow onions, thinly slice d
• teaspoon salt
• 1/2 teaspoon ground black pepper
• pound ground beef
• teaspoon garlic salt
• 1/4 teaspoon black pepper
• slice sSwiss cheese
• slice srye bread
• teaspoon sbutter

Instructions

1. 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.
2. Meanwhile, combine ground beef, garlic salt, and pepper in a bowl and mix thoroughly. Shape ground beef into 4 rectangular patties.
3. 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.
4. Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.
5. Spread 1 teaspoon butter over each slice of bread. Broil until lightly golden and toasted. Assemble patty melts and serve immediately.