01 -
Combine chocolate cake mix with eggs and oil per package directions. Fold in sour cream and chocolate chips.
02 -
Pour batter into a 9x13-inch baking pan and bake according to package instructions. Remove when fully baked.
03 -
While cake is still warm, poke holes across surface using handle of a wooden spoon. Reserve 5 tbsp caramel, pour remainder into holes.
04 -
Refrigerate cake for at least 30 minutes to allow caramel to set.
05 -
Spread vanilla frosting evenly over chilled cake. Top with crumbled Butterfinger and drizzle reserved caramel.
06 -
Slice into squares and serve chilled or at room temperature.