Combine and Form: In a mixing bowl, combine ground beef with freshly cracked black pepper, salt, and onion powder. Gently mix, being careful not to overwork the meat. Divide the mixture into three portions, then shape them into flat patties slightly larger than the bread slices to account for shrinkage during cooking.

Cook the Patties: Heat a frying pan or griddle on medium-high heat. Cook the patties for about 3-4 minutes per side, until they’re browned and fully cooked through. Remove from the heat and set aside.

Mix the Sauce: In a small bowl, whisk together mayonnaise, ketchup, bacon bits, sweet relish, and sugar. Set aside for assembly.

Butter the Bread: Spread softened butter evenly on one side of each slice of rye bread.

Layer the Ingredients: On the unbuttered side of three bread slices, spread the prepared sauce. Add a slice of cheddar cheese, a cooked beef patty, a slice of provolone cheese, and top with another slice of bread, buttered side facing out.

Grill the Sandwiches: Heat a skillet or griddle over medium heat. Place the assembled sandwiches on the griddle and cook for 2–3 minutes per side, pressing gently with a spatula, until the bread is golden brown and crispy, and the cheese is melted.

Cut and Enjoy: Slice the patty melts into halves and serve immediately with your favorite sides, such as crispy fries, tangy pickles, or a refreshing side salad.