Crust: Run the whole pack of Oreos in a blender to make crumbs. Add butter and stir together. Press into a springform pan and refrigerate while making the filling.
Filling: Mix softened cream cheese, sugar, and cocoa until smooth. Add vanilla and mix.
Melt chocolate chips in microwave, stirring every 15 seconds until melted. Add melted chocolate chips into the cream cheese mixture and blend well.
Fold in Cool Whip until thoroughly mixed. Place filling on top of crust and refrigerate for about 2 hours.
Top with berries, whipped cream, chocolate sauce, or whatever you fancy!
