Combine soups, onion, mushrooms, chilies ... baking dish arrange layers in this order using 1/2 ... soup mixture, then chicken, tortillas, then cheese. Repeat ... time is 1 hour.
Butter or Pam a 15"x9" ... Put 1/2 of chicken pieces on tortillas then pour ... chicken. Make another layer of each. Top with generous ... hours at 300 degrees.