Preheat oven to 350 degrees. Place the cube steak in a single layer in a 2 quart casserole dish, salt and pepper and dot with butter. Layer onions then the potatoes over the meat and cover completely with the soup. Cover tightly with a lid or aluminum foil and bake for 1 to 1 1/2 hours or until meat is tender. Let the casserole cool a few minutes before serving.
Recipe can be enlarged for more servings, make sure that you have enough soup to cover it completely!!!!