Make the Secret Sauce: In a small bowl, whisk together mayonnaise, ketchup, Dijon mustard, pickle relish, garlic powder, onion powder, salt, and pepper until smooth. Set aside.
Caramelize the Onions: In a skillet over medium heat, melt 1 tablespoon of butter. Add the sliced onions and cook for 10-12 minutes, stirring frequently, until they are soft and golden brown. Remove from heat and set aside.
Prepare the Patties: Divide the ground beef into 4 equal portions and shape them into thin patties, slightly larger than the bread slices. Season with salt and pepper on both sides.
Cook the Patties: In the same skillet, cook the patties over medium-high heat for 3-4 minutes per side, or until they reach your desired doneness. Set aside.
Assemble the Patty Melts: Spread butter on one side of each slice of rye bread. On the unbuttered side, spread the secret sauce. Layer with a slice of cheese, a beef patty, caramelized onions, another slice of cheese, and top with another slice of bread (buttered side facing out).
Grill the Patty Melts: In the same skillet, cook each patty melt over medium heat for 2-3 minutes per side, until the bread is golden brown and the cheese is melted.
Serve hot with extra sauce on the side for dipping!
Prep Time: 15 minutes | Cook Time: 20 minutes | Servings: 4
Enjoy these delicious Patty Melts with a tangy, creamy secret sauce! 🍔
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