Cook first 4 ingredients in a saucepan over medium heat, stirring until smooth. Stir in macaroni, and spoon into a lightly greased 11- x 7-inch baking dish.
Toss together cracker crumbs and butter. Sprinkle mixture over macaroni.
Bake at 350° for 25 minutes or until lightly browned.
Note: For testing purposes only, we used Velveeta cheese product.