Heat oven to 400 degrees F. Arrange tortillas in single layer on baking sheet.
Drain tomatoes; squeeze dry. Puree tomatoes in blender. Combine corn, beans, chiles, chili powder and cumin in a bowl.
Spread 3 tablespoons tomato puree over a tortilla. Sprinkle 1/4 cup corn mixture over sauce. Top with 2 tablespoons cheese. Repeat with remaining tortillas and toppings.
Bake pizzas in 400 degree F oven for 5 to 7 minutes or until the cheese is melted. Makes 16 pizzas.