Ham and Au Gratin Potatoes

    6 medium potatoes, peeled and sliced
    1 medium onion, chopped
    1 1/2 cups diced ham
    1 cup shredded American cheese
    1 (10 1/2 ounce) can cream of mushroom soup
    1/2 cup milk
    1/2 teaspoon thyme
    In 9x13 casserole dish layer 1/2 the potatoes, onion, ham, and cheese.
    Repeat layers.
    Mix soup, milk, and thyme.
    Pour over top. Cover with foil.
    Bake at 370* for 1 hour 15 minutes or until potatoes are done.