1/2 teaspoon onion powder
Roughly eight ounces of Swiss cheese, sliced
Instructions:
Heat olive oil in a big pan over medium-low heat. Add the sliced onions and cook, stirring regularly, for 20 to 25 minutes until caramelized and very brown. Season with salt and pepper to taste.
While the onions cook, heat a cast-iron skillet over medium-high heat. Melt 2 tablespoons of butter in the hot pan.
In a large bowl, gently mix the ground beef, ketchup, Worcestershire sauce, 1/2 teaspoon onion powder, 1 teaspoon salt, and a pinch of pepper. Form the mixture into four equal patties, each slightly wider than the bread slices.
Cook the patties in the hot pan for 4-5 minutes on each side until nicely browned. Remove from the skillet and set aside.
Assemble the patty melts: Wipe out any excess grease from the pan and melt 2 more tablespoons of butter. Place four slices of rye bread in the pan, butter side down. Top each slice with a burger patty, Swiss cheese, half the caramelized onions, and another slice of cheese. Close the sandwiches with the remaining bread slices, butter side up.
Cook each patty melt for 2-4 minutes per side, gently pressing down with a spatula until golden brown and the cheese is melted.
Once done, remove the melts from the pan and cut them diagonally. Enjoy your delicious sandwiches!
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