Preheat oven to 450ΒΊ.
Pound each breast thin with a meat mallet. Place a piece or parchment between mallet and chicken. Then, cut each piece in half, so you have four cutlets. Season chicken with salt and pepper.
Whisk eggs in a shallow bowl, season with salt, and set aside.
Place SEASONED bread crumbs in a shallow bowl or plate, set aside. (I like Italian seasoned.)
Place flour in another shallow bowl or plate, season with salt, and set aside.
Working in an assembly line, dip/dredge cutlets into flour (shake off excess), then eggs, then breadcrumbs. Pressing the bread crumbs into the chicken.
Set each cutlet on a plate or baking sheet. Repeat for each cutlet. Refrigerate breaded chicken for 15 minutes.
Heat equal parts olive oil and butter (1/8β - 1/4β deep) in a heavy skillet over medium-high heat, until hot. Cook chicken until golden, about 2 minutes on each side. Place chicken in a large baking dish. (It will finish cooking in the oven.)
Top each cutlet with 1/4 cup marinara sauce and 1/4 cup mozzarella. Sprinkle parmesan and Italian seasoning.
Bake until browned and bubbly, and chicken breasts are cooked through, 15 to 20 minutes.
Sprinkle with more parmesan and serve with remaining marinara sauce.