Make the Secret Sauce: Mix all sauce ingredients in a small bowl. Adjust seasoning and set aside.
Caramelize Onions: In a skillet over medium heat, melt 1 tbsp butter. Add onions, season with salt and pepper, and cook 10–15 minutes until golden and soft. Transfer to a plate.
Cook the Patties: Form beef into 4 patties slightly larger than bread slices. Season with salt and pepper. In the same skillet, cook patties 4 minutes per side for medium (or until desired doneness). Set aside.
Assemble Sandwiches: Butter one side of each bread slice. On the non-buttered side of 4 slices, spread secret sauce, add a slice of cheese, a patty, caramelized onions, another slice of cheese, and top with a bread slice, buttered side up.
Grill the Sandwich: In a clean skillet over medium heat, grill sandwiches 3–4 minutes per side until golden brown and cheese melts.
Prep Time: 15 min | Cooking Time: 30 min | Total Time: 45 min
Calories: 650 kcal per serving | Servings: 4
I’m staying active with this one 😋 Who’s hungry for a patty melt?
