First Step: MAKE THE BEEF PATTIES

1. Season the Beef: In a large mixing bowl, combine the ground beef with salt, pepper, and optional seasonings like Worcestershire sauce and garlic powder. Mix gently until the seasonings are evenly incorporated into the meat. Be careful not to overwork the beef to avoid making the patties tough.
2. Form the Patties: Divide the seasoned beef into 2 equal portions and form them into round patties that are slightly larger than the bread slices. This allows the patty to fit perfectly once it shrinks slightly during cooking.
3. Cook the Patties: Heat a large skillet or griddle over medium-high heat and add a tablespoon of olive oil or butter. When the pan is hot, add the beef patties and cook for 4-5 minutes per side, or until the patties are browned and cooked through (internal temperature should reach 160°F or 71°C). Remove the patties from the skillet and set them aside to rest.

Second Step: CARAMELIZE THE ONIONS

1. Sauté the Onions: In the same skillet, add the sliced onions and a pinch of salt. Cook the onions over medium heat, stirring occasionally, until they become soft and golden brown. This should take about 10-12 minutes. The caramelized onions will add a rich, sweet flavor that complements the savory beef and cheese.
2. Set the Onions Aside: Once the onions are caramelized, remove them from the skillet and set them aside. You’ll use them to top the patties later.

Third Step: ASSEMBLE THE PATTY MELTS

1. Prepare the Bread: While the onions are caramelizing, butter one side of each slice of rye bread. This butter will create a crispy, golden crust when toasted. If you’re using a griddle, butter both sides of the bread for even crisping.
2. Assemble the Sandwich: On the unbuttered side of two slices of rye bread, place a slice of Swiss cheese. Then, add the cooked beef patties on top of the cheese, followed by a generous scoop of the caramelized onions. Top with another slice of Swiss cheese and place the remaining slices of rye bread (buttered side out) on top to form a sandwich.

Fourth Step: GRILL THE PATTY MELTS

1. Toast the Sandwiches: Heat a clean skillet or griddle over medium heat. Place the assembled patty melts in the pan and cook for about 3-4 minutes per side, or until the bread is golden brown and the cheese has melted completely. Press down gently with a spatula to ensure even toasting and melty cheese.
2. Check for Melty Cheese: The sandwich should be golden brown on both sides, with the cheese inside perfectly melted. If the bread is browning too quickly before the cheese has melted, lower the heat slightly and continue cooking until everything is perfectly crisp and gooey.
3. Serve: Once the patty melts are toasted to perfection, remove them from the skillet, slice them in half, and serve immediately. You can garnish the sandwiches with additional caramelized onions or a sprinkle of fresh herbs for extra flavor.