1️⃣ Make the Secret Sauce:

• In a bowl, whisk together mayonnaise, ketchup, Dijon mustard, Worcestershire sauce, garlic powder, smoked paprika, and diced pickles.
• Cover and refrigerate until ready to use.

2️⃣ Caramelize the Onions:

• In a skillet over medium heat, melt 2 tbsp butter.
• Add sliced onions and a pinch of salt. Cook, stirring occasionally, for 20-25 minutes until golden and caramelized. Remove from heat.

3️⃣ Cook the Beef Patties:

• Divide the ground beef into 4 equal portions and shape into oval patties (slightly larger than the bread, as they shrink while cooking).
• Season both sides with salt and pepper.
• Heat a skillet over medium-high heat and cook patties for 3-4 minutes per side, or until desired doneness. Set aside.

4️⃣ Assemble the Patty Melts:

• Spread secret sauce on one side of each bread slice.
• Layer Swiss cheese, a beef patty, caramelized onions, and another slice of Swiss cheese.
• Top with another slice of bread, sauce side down.

5️⃣ Toast the Sandwiches:

• Spread a thin layer of mayonnaise on the outside of the bread (for extra crispiness).
• Cook on a griddle or skillet over medium heat for 2-3 minutes per side, until golden brown and the cheese is melted.

6️⃣ Serve & Enjoy!

• Slice in half and serve warm with extra secret sauce for dipping.