This is a family favorite-from my dear friend Sandra. Below is the exact recipe given to me but over the years I have tried many additions and substitutions like: adding mushrooms, poblano or jalapeno peppers, roasted red peppers, kernel corn, diced carrots, sliced zucchini or yellow squash, spinach; or substituting monterrey jack or cheddar cheese, flour tortillas instead of corn, you get the idea-just make it your own! (Plus, don't worry so much about the layers-I've tossed everything together and poured into pan, topped w/ cheese and it was still great.) You can make this a day ahead and it also freezes well-just thaw in refrigerator overnight and bake as directed. If it is too thick (because the tortillas soak-up moisture), just thin w/ some chicken stock. (I've seen other recipes where you soak the tortillas in broth but I've never tried it.) Cooking time does not include time to cook the chicken. I hope you enjoy this as much as I do!!!