Remove all the frozen pizzas from their boxes and wrapping. On one of the cheese pizzas, add zucchini, mushrooms, and bell peppers. On the pepperoni pizza, add olives. Leave last cheese pizza plain.
Place all three pizzas directly on the rack in the oven. Cook for 10-12 minutes on 450°F until cheese is browned and bubbly and edges look golden and crisp.
Serve while warm in a pizza bar, and don't forget to drizzle the pepperoni and olive pizza! Enjoy!