In a large microwave-safe bowl, combine the soup and cream cheese. Cover and cook on high for 3-4 minutes or until cream cheese is melted, stirring occasionally. Add the potatoes and stir until coated., Spoon into a greased 13x9-in. baking dish. Bake, uncovered, at 350° for 35-40 minutes or until the potatoes are tender. Sprinkle with cheddar cheese. Bake 3-5 minutes longer or until cheese is melted.