Combine all of the ingredients in a large mixing bowl and beat on medium for about a minute.
Spray some vegetable oil on the inside of your slow cooker. Carefully pour the cake batter into the cooker.
Cover and cook on LOW for 7-8 hours. You can see when the cake is ready, test it at 7 hours.
Slice up the cake and serve with a dollop of whipped cream. Top with chocolate squares