1. Prepare the Secret Sauce
Mix mayonnaise, ketchup, relish, Worcestershire sauce, garlic powder, and onion powder in a small bowl.
Season with salt and pepper, then set aside while preparing the sandwich.
2. Caramelize the Onions
Melt 1 tablespoon of butter in a skillet over medium heat.
Add the sliced onions, season lightly, and cook for 10–15 minutes until soft and golden. Remove and set aside.
3. Cook the Beef Patties
Shape the ground beef into 4 thin patties slightly larger than the bread slices.
Season both sides with salt and pepper.
Cook in the same skillet for about 4 minutes per side, or until cooked to your preferred level. Remove from the pan.
4. Assemble the Sandwiches
Butter one side of each bread slice.
On the unbuttered side, spread the secret sauce, then add:
- A slice of Swiss cheese
- A beef patty
- Caramelized onions
- Another slice of cheese
Top with another slice of bread, buttered side facing outward.
5. Grill Until Golden
Heat a clean skillet over medium heat.
Cook the sandwiches for 3–4 minutes per side until the bread is crispy and golden, and the cheese is perfectly melted.
Tips for the Best Patty Melt
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