1
Preheat the oven to 450°. Lightly spray a large baking sheet with cooking spray.
2
Slice the chicken breasts in half horizontally to make 6 cutlets. Season both sides with salt.
3
In a shallow bowl, combine the bread crumbs and Parmesan. In a small bowl, combine the butter and olive oil. Brush the butter and oil on both sides of the chicken, dredge the chicken in the bread crumb mixture, and place on the baking sheet. Lightly spray cooking spray on top.
4
Bake until golden on the bottom, about 20 minutes. Turn the chicken over and bake until the center is cooked through and the bottom is golden, 5 to 6 minutes.
Meanwhile, in a large, deep covered skillet, cook the marinara sauce over medium heat until heated through, 2 to 3 minutes.
Place the baked chicken in the skillet and top each piece with 1½ tablespoons of the mozzarella. Cover the pan and cook until the cheese melts, 3 to 4 minutes.