A Patty Melt combines juicy beef, caramelized onions, and melted Swiss cheese between crispy, buttery bread. This diner classic delivers rich flavors and a perfect crunch, making it a comforting and satisfying meal.

Ingredients:
- 1 sweet yellow onion, thinly sliced
- 2 tablespoons butter, divided
- 1 tablespoon apple cider vinegar
- 8 ounces 90/10 ground beef
- 1/4 teaspoon salt
- 1/4 teaspoon black pepper
- 4 slices sandwich bread
- 4 slices Swiss cheese
- Mustard (optional)
Direction:
- Caramelize the Onions
- Melt 1 tablespoon of butter in a large cast-iron skillet over medium heat. Add the sliced onions and cook, stirring occasionally, for about 25 minutes until they develop a deep golden-brown color. Adjust the heat to medium-low if they begin to burn. In 5 minutes, stir in apple cider vinegar, then remove the onions from the skillet.
- Prepare the Beef Patties
- Divide the ground beef into two thin 4-ounce patties, shaping them to match the size of your bread. Season with salt and black pepper.
- Increase the skillet heat to medium-high and add the patties. Cook for 3 minutes per side until fully cooked through. Remove from the skillet once done.
- Toast the Bread
- Wipe the skillet clean, then melt the remaining 1 tablespoon of butter. Place all four slices of bread in the skillet, ensuring one side of each is coated with butter. Once toasted, remove two slices and leave the other two in the skillet.
- Assemble the Patty Melts
- On each slice of bread still in the skillet, layer:
- 1 slice of Swiss cheese
- 1 cooked beef patty
- Half of the caramelized onions
- Another slice of Swiss cheese
- Top each sandwich with the remaining slices of bread, buttered side up.
- Grill the Sandwiches
- Lower the heat to medium-low and cook for 3-4 minutes per side, until the bread is golden and crisp, and the cheese is fully melted.
- Serve
- Slice in half and serve immediately while warm. Mustard can be added for an extra kick of flavor.
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- Enjoy your Patty Melts with Secret Sauce.