Flatten the chicken to 1/4 inch thickness. Place three slices of pepperoni and one slice of cheese on each. Roll up tightly, secure with toothpicks. Place in a greased 11x7x2 inch baking dish. spoon pizza sauce over roll ups. Cover and bake at 350°F.  for 35 -40 minutes. Uncover, top with the remaining cheese. Bake 5 - 10 minutes longer or until cheese is melted. Sprinkle with parsley if desired. 4 servings