In a 12-inch skillet cook ground beef, peppers, and onion till meat is brown. Drain off fat.
Stir in soup, sliced olives, salsa, and water. Bring to a boil and reduce heat.
Simmer, uncovered, for 5 min. Remove from heat.
Meanwhile, prepare corn muffin mix according to package directions.
Spread half of the muffin batter into a greased 13x9x2-inch baking dish. Spoon the hot meat mixture over the muffin layer.
Carefully spread the remaining corn muffin batter over the meat mixture.
Bake in a 350 degree oven for 30-35 min. or until muffin layer is golden.
Top with cheese. If desired, garnish with tomatoes and whole olives.
Cut into squares and serve.