Form the meat into 3 flattened patties with roughly the same shape as your bread slices.
Season the meat on both sides with the onion powder, garlic powder and salt and pepper to taste.
Cook the patties over medium high heat on the stove until cooked through. Remove from the pan.
While the meat is cooking, mix together the ingredients for the sauce until well incorporated.
Wipe the skillet used to cook the meat clean and reduce the heat to medium.
Butter one side of each piece of bread well.
Place three pieces of bread buttered side down in the skillet.
Top each slice of bread with 2 slices of provolone cheese, a meat patty and 2 slices of cheddar cheese.
Put a little bit of the sauce on the non-buttered side of the remaining slices of bread, and place them sauce side down on top of the patty melts in the skillet.
Flip the patty melts over once the provolone has melted and the one side of the bread is well toasted.
Toast the other side of the bread well, and then serve.
