Patty Melt with Secret Sauce

Main Ingredients for Patty Melts:

IngredientsQuantities
Ground beef1 lb.
Rye bread6 slices
Onion powder½ tsp.
Garlic powder½ tsp.
SaltTo taste
PepperTo taste
Cheddar cheese6 slices
Provolone cheese6 slices
Butter (softened and unsalted)6 Tbsp.

Secret Sauce Ingredients:

IngredientsQuantities
Mayonnaise¼ cup
Chopped bacon pieces2 Tbsp.
Ketchup3 Tbsp.
Sugar1 tsp.
Relish1 tsp.