What are the toppings on top of a pizza: pizza sauce, onions, butter, gooey cheese (special kind, otherwise it won't shred), fruits, self-rising flour, eggs, milk, green peppers, bacon, peas, corn, mushrooms, monosodium glutamate (MSG), pepperoncini, hot and sour sauce, olive oil, and so on. Pizza is usually made with a leavened round of dough covered with tomato sauce, cheese and other toppings and baked in an oven.