In a large skillet, saute the chicken green pepper and onion in oil until chicken is no longer pink and vegetables are crisp-tender. Add the corn, broth, salsa, salt, chili powder if desired and pepper; bring to a boil., Stir in the rice; cover and remove from the heat. Let stand for 5 minutes. Fluff with a fork. Sprinkle with cheese. Cover and let stand for 2 minutes or until cheese is melted.