This Crock Pot Reuben Casserole with Corned Beef is a delicious twist on the classic Reuben sandwich. Layers of corned beef, sauerkraut, Swiss cheese, and Thousand Island dressing are slow-cooked to perfection in a crock pot. The result is a warm and comforting casserole that is perfect for a family dinner or potluck. Serve it with rye bread or crackers for a complete meal.