Hamburger Potato Casserole

1 lb. lean ground beef
3 cups thinly sliced potatoes (either peeled or with thin skins)
1/2 cup chopped onions
1 can Cream of Mushroom soup
3/4 cup milk
1 1/2 cups shredded cheese
salt and pepper to taste

Preheat oven to 350 degrees and lightly grease an 11 x 7 (2 quart) glass baking dish. In medium skillet, cook the onions and ground beef until done. Drain the grease. In a medium bowl, mix together the milk, soup, salt and pepper. Layer half of the potatoes, soup, cheese and then the hamburger meat. Repeat with the rest of the potatoes, soup, hamburger meat and then the cheese. Cover with aluminum foil and bake for 1 to 1 1/2 hours or until the potatoes are tender.