01 -
Heat the oven to 350°F (175°C). Grease a 9 by 13 inch baking pan well.
02 -
In a large bowl, mix the cake mix with eggs, oil, water, and sour cream until smooth. Fold in the mini chocolate chips.
03 -
Spread the batter evenly in the pan. Bake for 30-35 minutes, or until the center springs back and a tester comes out with moist crumbs.
04 -
Cool the cake for 10 minutes. Use the handle of a wooden spoon to poke holes about 1 inch apart across the warm cake.
05 -
Pour the sweetened condensed milk slowly over the cake, aiming for the holes. Reserve 1/4 cup caramel, then pour the remaining caramel over the cake.
06 -
Let the cake cool to room temperature, then cover and refrigerate for at least 1 hour, or up to overnight.
07 -
Spread whipped topping over the chilled cake. Sprinkle with crushed Butterfinger candy and drizzle with the reserved caramel. Slice into 12 squares.