Brush canola oil over a jelly-roll pan, and top with tortillas. Sprinkle 3 tablespoons cheese over each tortilla, and divide the pepperoni among tortillas. Top each with 3 tablespoons cheese. Bake at 400° for 5 minutes. Remove from oven, and carefully fold each tortilla in half. Bake an additional 10 minutes or until browned and crisp, turning after 5 minutes. Serve with marinara.