In a large skillet, cook the beef, onion, green pepper and garlic over medium heat until meat is no longer pink; drain. Add the tomato sauce, corn, olives, chili powder, salt and pepper; bring to a boil. Reduce heat; simmer, uncovered, for 10 minutes.
Meanwhile, in a large saucepan, combine the cornmeal, milk and salt; bring to a boil, stirring frequently. Remove from the heat. Stir in cheese and egg.
Spoon meat mixture into an ungreased 1-qt. baking dish. Pour topping over meat mixture. Bake, uncovered, at 375° for 22-26 minutes or until a knife inserted in the center comes out clean.