Prep the chicken: Slice each chicken breast horizontally to make 4 thinner cutlets. If needed, pound to an even 1/2-inch thickness.
Pat dry and season both sides with 1/2 teaspoon salt, pepper, garlic powder, onion powder, and Italian seasoning.
Set up dredging stations: Put flour with a pinch of salt in one shallow bowl. Beat eggs with 1 tablespoon water in a second bowl. Mix panko, Parmesan, and olive oil in a third bowl until the crumbs look lightly moistened.
Preheat and pan prep: Heat oven to 425°F (220°C).
Place a wire rack on a rimmed baking sheet and lightly grease it. The rack helps the bottoms crisp.
Bread the cutlets: Dredge chicken in flour, shaking off excess. Dip in egg, then press into the panko-Parmesan mix until well coated.
Set on the rack.
Bake for crispiness: Bake 12–15 minutes, flipping once halfway, until the coating is golden and the internal temperature reaches 160°F (71°C). The chicken will finish cooking in the next step.
Add sauce and cheese: Spoon about 2 tablespoons marinara over each cutlet—just enough to cover the top without soaking the crust. Sprinkle mozzarella over the sauce.
Finish under heat: Return to the oven for 3–5 minutes, or broil for 1–2 minutes, until cheese is melted and bubbling.
Chicken should reach 165°F (74°C).
Garnish and serve: Let rest 2 minutes. Add fresh basil or parsley and a pinch of red pepper flakes if you like.