Preheat the oven to 350° and in a large bowl prepare the cake mix accordingly to the back of the box. Spray a 9x13 baking dish with non stick cooking spray. Once the batter is made, pour into the prepared pan and place in the preheated oven. Bake for 25-30 minutes.
1 15 oz box duncan hines chocolate cake mix, 1 cup water, 1/3 cup vegetable oil, 3 eggs
Let the cake cool completely.
Using a skewer, or the end of a wooden spoon, poke holes all around the top of the cake, making sure to go halfway/ all the way down.
In a medium sized bowl add the condensed milk, caramel sauce, peanut butter, powdered sugar, vanilla extract and the chopped butterfingers and stir until well combined.
1 14 oz can sweetened condensed milk, 1/2 cup caramel sauce, 1/3 cup peanut butter, 1/3 cup powdered sugar, 1/2 tsp vanilla extract, 8-10 fun sized Butterfinger candy bars
Pour the mixture all over top of the cake and making sure to spread into the holes as well and all over. Cover the cake and place in the refrigerator for 1-2 hours.
Once it has chilled, whip the cream using a hand mixer until stiff peaks have formed, then spread it all over top of the cake evenly. Sprinkle the 1/2 cup of butter fingers all over top of the whipped cream.
Slice, serve, and enjoy!