In large skillet brown beef; break up large chunks with fork. Pour off fat. In a small bowl, mix together salt, pepper, onion and undiluted soup. Peel and slice potatoes. In crockpot arrange alternate layers of potatoes and meat, with potatoes on bottom. Pour soup mixture over. Cover and cook on LOW for 4 to 6 hours. Turn control to high. Pour cream over all; cover and cook on HIGH for 15 to 20 minutes.