Spray a medium skillet with nonstick cooking spray. Saute bell pepper and corn over medium heat until softened, about 5 minutes.
Add green onion and tomato; cook for several minutes more until heated through; stir in cilantro.
Heat tortillas in a large skillet over high heat. Place equal amounts of cheese and vegetables on each fortilla; fold in half and continue to cook until cheese is melted and tortilla is crisp and lightly browned. Serve while hot.