Grease a 9x13 casserole dish and layer half of the: chicken, sour cream, tortilla cubes, sauce, and cheese. Repeat these layers once more and bake, covered, for 40 minutes.
Uncover and bake an additional 10 minutes making sure to let it rest for about 15 minutes before serving.
Top with an additional ingredients including: cilantro, avocados and tomatoes.