This crockpot Reuben dip has all the best qualities and flavors of the classic Reuben sandwich in the form of a dip made with salty corned beef, cream cheese, Swiss cheese, tangy sauerkraut, and thousand island dressing. There's nothing more comforting than a warm creamy dip and it's even better when it's a true dump-and-set slow cooker recipe like this one!