Preheat the oven to 450°F (230°C) and line a cookie sheet or baking tray with parchment or spray with cooking spray.
Using a sharp knife, slit the chicken breasts in half to get 4 thin fillets. Then slice the fillets down the middle to get 8 equal sized, almost square chicken pieces. In a shallow, wide bowl mix panko, parmesan cheese, Italian seasoning and salt and pepper.
Using a brush, apply a light layer of melted butter (or olive oil) to chicken pieces.
Dip the chicken piece into panko mixture one at a time, making sure that the chicken is evenly coated with breadcrumb parmesan mixture.
Place on the prepared cookie sheet and repeat with the remaining chicken pieces.
Lightly spray the chicken pieces with olive oil cooking spray and bake for 25 minutes.
While the chicken is baking you can go onto make your pasta and a vegetarian side or a salad.
Remove the cookie sheet from the oven, spoon ½ tablespoon marinara sauce over each piece of chicken and top with ¾ tablespoon of mozzarella cheese.
Return the chicken back to the oven for 5 more minutes or until cheese is melted and bubbly.
Serve over pasta or enjoy it as is.