I used one of Sysco's pre-baked pizza shells and had the campers apply either pesto or pizza sauce to each pizza. We then topped them with mozzarella, sprinkling of cheddar cheese and Parmesan.
The pizza were baked in a 450- to 500-degree oven and cut into eighths. Here's the breakdown for 45 campers and staff:
20 pizzas total
10 cheese with tomato sauce (50%)
6 cheese with sausage (30%)
4 cheese with pesto and various toppings (20%)