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Poke the Cake: Using the handle of a wooden spoon, poke holes all over the surface of the cake. Make the holes large enough to let the filling seep into the cake.
Add Caramel and Condensed Milk: In a small bowl, combine the sweetened condensed milk and caramel sauce. Pour this mixture evenly over the cake, ensuring it fills the holes. Allow the cake to cool completely.
Top with Whipped Topping: Once the cake has cooled, spread the thawed whipped topping evenly over the surface.
Add Crushed Butterfinger: Crush the Butterfinger candy bars and sprinkle them generously over the whipped topping.