Making a Patty Melt with Secret Sauce is a straightforward process. Follow these easy steps to create this delightful dish:

1. Make the Sauce: In a small bowl, mix together the mayonnaise, ketchup, Dijon mustard, Worcestershire sauce, garlic powder, onion powder, salt, and pepper until well blended. Set aside.

2. Cook the Onions: In a skillet over medium heat, melt 1 tablespoon of butter. Add the sliced onions and cook until they are golden brown and caramelized, about 8-10 minutes. Remove from the skillet and set aside.

3. Form the Patties: In a bowl, form the ground beef into two equal-sized patties. Season with salt and pepper.

4. Cook the Patties: In the same skillet, add another tablespoon of butter and increase the heat to high. Add the patties and cook until browned on one side, about 3-4 minutes. Flip the patties.

5. Add Cheese: After flipping the patties, lay two slices of Swiss cheese on top of each patty. Cover the skillet with a lid to help the cheese melt, cooking for an additional 3-4 minutes.

6. Prepare the Bread: While the cheese melts, spread the remaining butter on one side of each slice of rye bread.

7. Assemble the Melt: On the non-buttered side of two slices of bread, spread a generous amount of the secret sauce. Place a cheesy patty on each, followed by some caramelized onions. Top with the other slices of bread, buttered side up.

8. Grill the Melt: In the same skillet, grill the sandwiches over medium heat until golden brown on both sides, about 3-4 minutes per side.

9. Slice and Serve: Once both sides are crispy and the cheese is fully melted, remove the melts from the skillet. Slice them in half and serve immediately.