I originally got this idea from my Mom. She fed us tortilla pizzas growing up because they are cheap, quick and yummy! Now I feed them to my kiddos and its a favorite in our house.
Take pizza sauce (or leftover spaghetti sauce) and spread a light layer on a tortilla. Grate a layer of cheese over the tortilla and add some pepperoni or other toppings you like. Onions, green peppers and olives work well. Set oven to Broil and lay the pizzas on a cookie sheet. Bake until cheese is melted and bubbly. Keep an eye on them, it only takes about 4-5 minutes to cook.