This is my mother's recipe and was one of our family favorites growing up. It is now one of my family's favorites. I frequently serve these enchiladas for company and social events and they are always a huge hit. They are mild flavored enchiladas in a white sauce. I serve them with sour cream and green or red chili sauce for anyone that wants a spicier flavor. I frequently substitute 4-5 chicken breasts instead of a whole chicken - they cook faster and are easier to work with. (you need to yield 4-5 cups shredded chicken). To save time, cook the chicken ahead of time and refrigerate it so that it's cooled and ready to go when you put the casserole together.