Heat oven to 375°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Spread 2 tablespoons of the enchilada sauce in bottom of baking dish.
In medium bowl, mix tomatoes, chicken, onions and beans. In another medium bowl, mix remaining enchilada sauce and the veggie dip until well blended.
Arrange 8 tortilla pieces over sauce in dish, overlapping as necessary. Spoon half of the chicken mixture over tortillas; sprinkle with 1/2 cup of the cheese. Spoon half of the sauce mixture over cheese. Repeat layers once, reserving 1/2 cup cheese.
Cover with foil. Bake 40 to 45 minutes or until hot. Sprinkle with reserved 1/2 cup cheese. Bake uncovered about 5 minutes longer or until cheese is melted. Let stand 5 minutes before serving. Sprinkle with olives and cilantro.