In a bowl, combine the ground chicken breast with salt, black pepper, garlic powder, and finely grated Parmesan cheese. Form the mixture into 4 equal-sized patties.
In a hot skillet or on a grill, cook the chicken patties for 4-5 minutes on one side, then flip them over.
After flipping, place a slice of cheddar and a slice of mozzarella cheese on top of each patty. Cover the skillet to allow the cheese to melt.
Halve the hamburger buns and spread butter on the cut sides. Toast them in a skillet until golden brown.
Spread mayonnaise and mustard on the bottom half of each bun, then top with a lettuce leaf.
Place the cheese-covered chicken patty on top of the lettuce, followed by tomato slices and thinly sliced red onion.
Spread ketchup on the top half of the bun and sprinkle with a little oregano before closing the burger.
Serve immediately with french fries or a fresh salad.
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