In a bowl, combine olives, chili powder, cumin, and salt; set aside 2 Tablespoons of this mixture. Add the mayonnaise, sour cream, and green onions to the remaining olive mixture.
Place bread on an ungreased baking sheet and spread 1 Tablespoon of the mayonnaise mixture on each slice. Top with slices of turkey and tomatoes. Spread with another Tablespoon of mayonnaise mixture (I didn't add this because I didn't think it needed it). Top with avocados and cheeses. Sprinkle with the reserved 2 Tablespoons of olive mixture. Bake @ 350 for 15 min. Makes 8-10 servings.