Bake french fries according to package directions adding additional 5 mins to cook time. Remove fries from oven and place in oven proof serving dish ( I used my cast iron skillet) Layer first with pizza sauce, cheese, pepperoni, mushrooms, olives. Add another light layer of mozzarella cheese then the cheddar cheese and sprinkle top with Parmesan cheese. Place back in oven for about 5 mins or until cheese is melted and bubbly. Remove from oven, cool slightly and enjoy!