1 cup shredded part-skim mozzarella cheese (4 ounces)
Place a pizza stone on the lowest rack of the oven. Preheat oven to 450°F.
In a food processor or blender combine roasted red sweet peppers and pizza sauce. Cover and process or blend until smooth. Add salt to taste. Set aside.
In a large skillet heat oil over medium-high heat. Add red onion, green sweet pepper and mushrooms. Cook and stir about 5 minutes or until tender.
Divide pizza sauce mixture between tortillas, spreading evenly. Top with pepperoni and vegetable mixture. Sprinkle with cheese.
Transfer one of the pizzas to the hot pizza stone (see Tip). Bake about 5 minutes or until edges of the tortilla and the cheese are golden brown. Repeat with the remaining pizza.
Tip: To transfer the pizza to the hot stone, place pizza on a flat baking sheet; scoot pizza from baking sheet to pizza stone. When pizza is done, lift an edge of the pizza with a spatula, scoot the baking sheet under the pizza, and lift it off the stone.