Prepare the Bread

1. Thoroughly butter one side of each slice of rye bread and set aside.

Make the Patties

1. Combine ground beef, black pepper, sea salt, and onion powder in a bowl. Mix until the seasonings are evenly distributed.
2. Divide the mixture into three equal portions and shape into patties that match the shape of the bread.

Cook the Patties

1. Preheat a nonstick skillet over medium-high heat.
2. Add the patties to the skillet and cook for 2-3 minutes on one side. Carefully flip and cook for another 2-3 minutes.
3. Reduce the heat to low and cook for an additional 5 minutes, ensuring the center is no longer pink.
4. Use a digital thermometer to check that the internal temperature reaches 160°F (71°C). Once done, remove the patties from heat and set aside.

Make the Sauce

1. In a small bowl, combine mayonnaise, ketchup, bacon bits, sweet relish, and sugar. Mix well until smooth, then set aside.

Assemble the Patty Melts

1. Heat a second skillet over medium-low heat.
2. Place one slice of buttered rye bread (butter-side down) into the skillet.
3. Layer with two slices of cheddar cheese, a beef patty, and two slices of Provolone cheese.
4. Spread the sauce on the unbuttered side of another bread slice and place it sauce-side down on top of the cheese.

Toast to Perfection

1. Cook for 2-3 minutes on each side or until the bread is golden brown and the cheese is melted.
2. Repeat the process for the remaining sandwiches.

Serve and Enjoy

1. Once all patty melts are ready, serve them warm with your favorite sides or dipping sauces.