This is a real twist on mac and cheese and came from my mother. It is a favorite which is requested at all the holiday and family gatherings. It is very easy to make and will be a guaranteed hit with your family and friends.
Mix all ingredients together in a 9x13 baking pan, cover and put in refrigerator overnight. Remove the casserole from the refrigerator, set oven temp to 350 degrees and bake for 45 minutes checking for doneness. Prior to baking, check for moistness and if needed add a little more milk. At the end of 45 minutes, add more cheese on top and bake until done uncovered.