1. Peel, then slice potatoes thinly.
2. In a large bowl combine potatoes and Cream of Mushroom Soup.
3. Layer ½ of the potato mixture in a 13×9 x 2 inch baking dish.
4. Spread out half the butter, and ½ the cheese.
5. Add the rest of the potatoes
6. Apply the rest of the butter and cheese to the top.
Bake uncovered at 350 degrees for 60 minutes or till potatoes are tender.