Some people don't actually think the best part of any pizza is the crust. You can give them thin or deep dish; none of it matters. In fact, they don't really need a crust at all. Instead, when they want to dig into a pizza, it's all about the toppings. This version is topped with pepperoni because what pizza is complete without it?
If you're more of a meat lover than you are a veggie lover, add your favorite cooked meat right to the bottom of the casserole dish. Loose sausage removed from its casing and ground beef would work particularly well. You can also cut out some of the veggies -- or add even more. One of the best things about this casserole dish is that you really can truly make it your own.