Stir 4 tbsps Parmesan cheese into spaghetti sauce. Spray skillet with cooking spray and heat 1 min. Add chicken and cook until browned. Drain. Pour pasta sauce over chicken;turn breasts over to coat both sides with sauce. Cover and cook over medium heat 10 min or until done. Top with mozzarella and remaining Parmesan cheese. Let stand 5 min or until cheese is melted.