Bake cake according to box directions in oven temperature on box.

When cake has finished baking then remove from oven and poke holes in it using a fork.

Pour sweetened condensed milk over cake.

Pour half a jar of caramel topping over the cake (I used approximately ½ cup)

Then let cake cool completely.

Spread the cooled cake with thawed whipped topping and top with crushed butterfingers.