In a ungreased 1-1/2-qt. baking dish, combine potatoes with sauce mix, boiling water and butter. Stir in milk, ham and beans. Bake, uncovered, at 400° for 35 minutes or until the potatoes are tender, stirring occasionally. Sprinkle with cheese. Bake 5 minutes longer or until cheese is melted. Let stand 5 minutes before serving.