In each of two greased 13-in. x 9-in. baking dishes, arrange six tortillas. Top each with 1 cup chicken, 2/3 cup kidney beans, 1 cup salsa, 1/2 cup sour cream, 1/2 cup green pepper, about 1/3 cup olives, 1/2 cup Monterey Jack cheese and 1/2 cup cheddar cheese. Repeat layers twice.
Cover and bake at 350° for 25 minutes. Uncover; bake 10-15 minutes longer or until cheese is melted. Let stand for 10 minutes before serving. Yield: 2 casseroles (12 servings each).