In a small bowl, combine the corn bread mix, milk and egg. Stir in corn just until blended. Spread evenly into a 8X8 or 9X9 pan. Bake at 400°F for 14-18 minutes or until a toothpick inserted near the center comes out clean.
Meanwhile, in a large skillet, cook the turkey, onion, red pepper over medium heat until meat is no longer pink. Drain. Stir in taco seasoning and water; bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes.
Spoon turkey mixture over corn bread; sprinkle with cheese. Bake for 5-10 minutes or until the cheese is melted. Sprinkle with tomato, olives and green onions. Cut into six wedges; top each with sour cream.