Bake the chocolate cake in a 9x13” pan according to recipe instructions and allow it to cool for 10-15 minutes.
Poke holes all over the surface of the cake with a fork or wooden skewer.
Pour the caramel sauce generously over the top of the cake, followed by the sweetened condensed milk.
Let the cake cool completely at room temperature for about an hour.
In a mixing bowl, combine the creamy peanut butter and powdered sugar until smooth. Gradually add the heavy whipping cream and whip until stiff peaks form.
Spread the peanut butter whipped cream over the cooled cake.
Sprinkle the chopped Butterfinger bars evenly over the top.
Refrigerate for at least one hour before serving to allow flavors to meld.
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Notes
Store any leftovers tightly covered in the refrigerator for up to three days.