Preheat the oven to 425°F. Line a baking sheet with parchment paper or foil. Add a wire rack if using, and spray lightly with cooking spray.
Pat chicken dry. Season both sides with salt, pepper, garlic powder, Italian seasoning, and paprika.
Set up three bowls: flour in the first, eggs whisked with milk in the second, and panko mixed with Parmesan and minced garlic in the third.
Bread each cutlet: coat in flour (shake off extra), dip in egg, then press into the panko-Parmesan mixture.
Place breaded chicken on the prepared sheet. Brush or drizzle tops with melted butter (or olive oil).
Bake for 10 minutes. Flip the cutlets and bake 5-7 minutes more, until the chicken reaches 165°F.
Sprinkle mozzarella (and provolone, if using) over each cutlet.
Bake 2-3 minutes more, just until melted. For browned bubbles, broil 30-60 seconds, watching closely.
Rest 3-5 minutes. Top with parsley and serve warm.