Creamy Potato Casserole

8 med potatoes -- peeled/thinly sliced

1 sm onion -- chopped

1 10.75 oz can condensed cheddar cheese soup -- undiluted

1 c sour cream

1 tsp salt

Combine all ingredients; mix well. Place in a greased 8-inch square baking dish. Cover and bake at 350� for 70-75 minutes or until the potatoes are tender. Uncover and bake 10-15 minutes longer or until lightly browned.