1Pound chicken breasts to about 1/4 inch thickness between plastic wrap.
2Set up three shallow bowls: flour in one, beaten eggs in the second, and panko mixed with 1/4 cup parmesan, salt, and pepper in the third.
3Coat each chicken breast in flour, then egg, then breadcrumb mixture, pressing gently so it sticks.
4Heat olive oil in a large skillet over medium-high heat. Cook chicken in batches until golden brown, about 3 to 4 minutes per side. Move to a plate.
5Preheat your broiler to high.
6Spread a thin layer of marinara sauce in a baking dish. Arrange chicken pieces on top and spoon remaining sauce over each breast. Top generously with mozzarella.
7Place under the broiler for 2 to 3 minutes until cheese melts and bubbles. Keep an eye on it.