Slow Cooker Reuben Sandwiches are a delicious twist on the classic deli sandwich. Tender corned beef, tangy sauerkraut, melty Swiss cheese, and creamy Thousand Island dressing are piled high on rye bread and cooked to perfection in a slow cooker. The slow cooking process allows the flavors to meld together, resulting in a mouthwatering sandwich that is perfect for lunch or dinner.