Spray a medium skillet with nonstick cooking spray. Sauté 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; add cilantro. Heat tortillas in a large skillet over high heat; Place equal amounts of cheese and vegetables on each tortilla; fold in half and continue to cook until cheese is melted and tortilla is crisped and lightly brown. Serve while hot.