Preheat and Prep: Preheat the oven to 425°F. Line a large baking sheet with parchment paper and set a wire rack over the baking sheet.
Bread the Chicken: On a large plate, combine the panko, 3 tablespoons of the Parmesan, Italian seasoning, granulated garlic, salt, and black pepper, stirring with a fork until well combined.
Brush a thin layer of mayonnaise on both sides of each chicken cutlet, just enough to coat.
Press each cutlet firmly into the panko mixture, coating both sides evenly.
Place the breaded chicken on the wire rack on the prepared baking sheet and spray both sides generously with olive oil spray.
Bake: Bake for 23-25 minutes until the breading is golden and the chicken is cooked through (165°F internal temp), flipping once halfway through.
Add Sauce and Cheese: Remove from the oven and spoon the marinara on top (about 4 tablespoons per cutlet). Top each with the shredded mozzarella (about 2 tablespoons per cutlet) and remaining Parmesan (about 2 teaspoons per cutlet).
Return to the oven and bake for 5 minutes more, until the cheese is melted and bubbling. For extra golden cheese, broil for 1 to 2 minutes, but be sure to watch it closely to avoid burning.
Serve: Remove from the oven, allow to rest for 5 minutes, then serve whole or sliced over pasta if that’s your thing.