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Form the Patties: Divide the ground beef into three equal portions and shape them into flat patties roughly the size of your bread slices.
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Season the Meat: Sprinkle both sides of each patty with onion powder, garlic powder, salt, and pepper.
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Cook the Patties: Heat a skillet over medium-high heat and cook the patties until done. Remove from the pan and set aside.
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Make the Secret Sauce: In a bowl, combine mayonnaise, chopped bacon, ketchup, sugar, and relish. Mix until smooth.
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Assemble the Patty Melts: Wipe the skillet clean and reduce heat to medium. Butter one side of each bread slice. Place three slices buttered side down in the skillet. Layer with provolone cheese, a cooked patty, and cheddar cheese.
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Add the Secret Sauce: Spread a generous amount of secret sauce on the remaining bread slices and place them sauce side down on top of the sandwiches.
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Toast and Serve: Flip the sandwiches once the cheese melts and the bread is golden brown. Toast the other side to your preferred crispiness and serve immediately.