I already have a crockpot recipe for mac and cheese on this site. But I am submitting another one...a better one. My friend, Myrna has been baking this for many many decades and has shared it with me. It's delicious. No frills...no other seasonings needed because they're in the soup. The texture is just like the macaroni I remember as a child.
Cook elbows until el dente. Mix all ingredients including elbows in a large bowl. Pour in a greased 9x13. Layer crushed crackers on top and place pats of the butter throughout the top of the crackers. Bake uncovered 45-55 minutes at 350 degrees.