01 - 
                Mix the cake ingredients according to package instructions, and add in the sour cream and chocolate chips.
              
              
              
                02 - 
                Bake the cake in a 9 x 13 pan as directed on the cake mix package.
              
              
              
                03 - 
                Remove from the oven and poke holes in the cake while it’s still warm using the end of a wooden spoon.
              
              
              
                04 - 
                Set aside 5 tablespoons of the caramel topping and pour the remaining caramel into the holes in the cake.
              
              
              
                05 - 
                Place the cake in the refrigerator and chill for at least 30 minutes.
              
              
              
                06 - 
                Spread vanilla frosting on top of the chilled cake. Sprinkle the crumbled Butterfinger pieces over the top and drizzle with the remaining caramel.
              
              
              
                07 - 
                Slice the cake and serve immediately.