Crush the croutons with the garlic in a food processor. Dredge the chicken pieces in the crouton mixture. Place chicken in bottom of baking dish. Sprinkle any remaining crumbs on top of chicken. Top the chicken with the pasta sauce. Sprinkle mozzarella over top.
Place in oven and bake 35 to 40 minutes. Serve over spaghetti and top with parmesan cheese