Instructions:
1. In a large bowl, combine cake mix, water, butter and eggs. Mix until combined. Next, cut the Butterfinger candies into pieces and mix them into this dough.
2. Grease the slow cooker with cooking spray. Pour the cake batter into the slow cooker.
3. Cover slow cooker and cook on high for 2 hours or until a toothpick inserted into center of cake comes out clean.
4. Once the cake is cooked, turn off the slow cooker. Heat the hot fudge and garnish the cake.
6. Sprinkle additional crushed Butterfinger candy bars on top of the cake.
7. Serve hot with a dollop of whipped cream on top.