01 -
Combine chocolate cake mix with eggs and oil according to package instructions. Incorporate sour cream and chocolate chips into the batter, mixing until fully blended.
02 -
Pour the batter into a 23 x 33 cm baking pan. Bake as directed on the cake mix package, until a toothpick inserted in the center emerges clean.
03 -
Remove the cake from the oven and, while still warm, pierce evenly spaced holes throughout using the handle of a wooden spoon.
04 -
Reserve 5 tablespoons of caramel topping. Pour the remaining caramel over the cake, allowing it to seep into the holes.
05 -
Refrigerate the cake for at least 30 minutes to allow flavors to meld. Evenly spread vanilla frosting over the chilled cake.
06 -
Sprinkle crumbled Butterfinger bars over the frosting, then drizzle with the reserved caramel.
07 -
Slice the cake into portions and serve.