Preheat your oven to 375°F (190°C).
Pound the chicken breasts to an even thickness.
Season both sides of the chicken with salt and pepper.
Set up a breading station: one bowl with beaten egg, another with breadcrumbs mixed with Parmesan cheese.
Dip each chicken breast in the egg, then coat with the breadcrumb mixture.
Heat olive oil in a skillet over medium-high heat.
Fry the chicken cutlets for about 3-4 minutes on each side until golden brown.
Transfer chicken to a baking dish and top each piece with marinara sauce.
Sprinkle mozzarella cheese generously over the sauce.
Bake in the preheated oven for 15-20 minutes until the cheese is bubbly and golden.