In a zip lock bag crush Oreos and butterfingers. (It's easier to crush a little at a time and then put in a bowl.) Once all crushed, mix in a stick of melted butter. In a 9x13 pan press down ½ the mixture. Then, put ice cream on top of mixture. (I opened up the whole container of ice cream and cut it into slices...then it's easy to pat down in the pan.) Cover the ice cream with remaining ½ mixture. Lastly, put in the freezer until you're ready to eat it!