In a bowl, combine turkey, half cup sour cream, 1.5 teaspoons taco seasoning, half of the soup, 1 cup of cheese, onion, salsa and olives. Place one third cup filling on each tortilla. Roll up and place, seam side down, in a greased 9 x 13 baking dish . Combine remaining sour cream, taco seasoning and soup; pour over tortillas. Cover and bake at 180ºC . for 30 minutes or until heated through. SPrinkle with remaining cheese. Serve with shredded lettuce and chopped tomatoes. Top with additional salsa if desired.