Either in a food processor or a Ziploc bag, smash oreos as much as you can until they are small crumbs. This is easiest in a food processor but I don't have one so a bag and a meat mallet or rolling pin works great! Pour crumbs into a bowl and mix with melted butter. Pour this mixture into a pie pan and press so that it makes an even crust. Chill in the freezer for about 10-15 minutes. Let you ice cream thaw on the counter for a few minutes. Scoop out ice cream into crust. How much you scoop will depend on your pan size. I used a deep dish pie pan so I used all of the ice cream, but if yours is smaller just fill to the top. Smooth ice cream with a spatula or knife. Drizzle hot fudge on top. To make my drizzle pretty, I made a makeshift piping bag out of a small Ziploc bag by cutting the corner off. Then top with some mini chocolate chips! Place back in the freezer for at least 15 minutes to harden. Slice and enjoy!!