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Smashing Patty Melts With Signature Sauce

A classic patty melt made with juicy beef patties, caramelized onions, Swiss cheese, toasted rye bread, and a tangy homemade sauce. Comforting, quick, and family-approved.
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Ingredients
  

For the Patty Melts

  • 1 lb ground beef 80/20
  • 1 small yellow onion thinly sliced
  • 8 slices rye bread
  • 8 slices Swiss or American cheese
  • 2 tbsp butter plus more for toasting
  • Salt and black pepper to taste

For the Signature Sauce

  • ⅓ cup mayonnaise
  • 1 tbsp ketchup
  • 1 tbsp yellow mustard
  • 1 tbsp finely chopped pickles or relish
  • 1 tsp Worcestershire sauce
  • ¼ tsp garlic powder
  • Salt and pepper to taste

Instructions
 

  • Whisk mayonnaise, ketchup, mustard, pickles, Worcestershire sauce, garlic powder, salt, and pepper in a small bowl, then set aside.
  • Melt butter in a skillet over medium heat, add sliced onions, and cook 10–12 minutes until golden and soft. Remove from the skillet.
  • Divide beef into 4 portions, flatten into thin patties slightly larger than the bread, and season with salt and pepper.
  • Cook patties in the same skillet for 2–3 minutes per side until browned and cooked through. Set aside.
  • Butter one side of each bread slice. On the unbuttered side of four slices, layer cheese, a patty, onions, a spoonful of sauce, and another slice of cheese. Top with remaining bread, buttered side facing out.
  • Heat skillet over medium and grill sandwiches 3–4 minutes per side, pressing gently with a spatula, until golden and cheese is melted.
  • Slice diagonally and serve hot with extra sauce.