In a greased 9x13” pan, put the dry macaroni. Melt butter and pour over macaroni. Add cheese (reserve a little to sprinkle on top after done), milk, heavy cream and chilies. Add salt and pepper to taste. Combine.
Put into a preheated 250 F smoker for about 2 hours.
Top with reserved cheese. Put under broiler or into oven to brown. For variety, can also add chopped bacon or ham. Adapted from copymethat.com