In a large bowl, combine chicken, breadcrumbs, Parmesan, parsley, salt, pepper, and garlic. Mix until well combined, then form the mixture into patties.
Heat a large, lightly oiled, oven-safe skillet over medium-high heat. Fry the patties for 4-5 minutes on each side, or until they are golden brown and cooked through. Remove the patties from the skillet and cover them with foil to keep warm.
Add marinara sauce to the skillet and stir until heated. Return the patties to the skillet and top with mozzarella cheese. Broil on low in the oven for 2-3 minutes, or until the cheese has melted. Serve immediately on hamburger buns.
Notes
Mix the ingredients until just combined to avoid tough burgers. Overmixing can make the patties dense.
Use a meat thermometer to ensure the internal temperature of the patties reaches 165°F for safe consumption.