In a large skillet over medium heat, cook beef, onion, pepper and garlic until meat is no longer pink; drain. Add the next 7 ingredients; simmer, covered, until rice is tender, about 25 minutes., Stir in corn and olives; cover and cook 5 minutes more. Sprinkle with cheese; cook, covered, until cheese is melted, about 5 minutes. If desired, top with green onions.