Preheat oven to 500ºF. Mist both sides of 2 tortillas with cooking spray. Place tortillas on a baking sheet, top with half of tomatoes, pepperoni and cheese; bake on top rack for 3 minutes. Move to bottom rack and bake until tortillas are puffed and browned around edges, about 3 minutes longer. Sprinkle with half of basil.
While first two pizzas are baking, assemble remaining two pizzas on another baking sheet. Bake as directed above, sprinkle with remaining basil, and serve immediately.
I've been making these for a couple of weeks now in my attemp to eat lower calories for dinner. I'm using whole wheat tortilla shells & lots of garlic plus the fat free cheese & turkey pepperoni. Bit of olive oil & bake in oven bottom rack 10 minutes exactly 350 & they are perfectly thin crust crispy goodness. Try this baking time for better tasting pizza's. Don't forget the parmesan cheese you can load this type of pizza up with any of your favorite veggies too.
I'm rating this a 5 because it was incredibly easy and very good. Made with whole wheat tortillas, Pom brand chopped tomatoes and fresh mozzarella cheese. Did not use pepperoni (so I could count it as a meatless meal). Liberally sprinkled chiffonaded fresh basil on after cooking and drizzled a little extra virgin olive oil. Served with a salad to complete the meal. Will definitely make again. Would likely be excellent done on the grill during the summer, too.