Cut the sliced cheese into four equal pieces each, making 16 small square slices.
Put the egg white in a shallow dish. Mix the Parmesan cheese, breadcrumbs, salt and pepper in another shallow dish.
Dredge chicken pieces through the egg white and then coat each piece of chicken with the breadcrumb mixture.
Spray a sauté pan with cooking spray and cook chicken over medium heat about 4-5 minutes or until golden. Flip the chicken and cook it 4-5 additional minutes or until the chicken is thoroughly cooked.
Once chicken is cooked and slightly browned, spoon 1 teaspoon spaghetti sauce on each piece of chicken and top each with one small square of the sliced cheese.
Allow to cook until cheese melts, about 2 minutes.