Line an 8x8 or 9x9 inch square pan with aluminum foil.
In a medium bowl stir together the Oreo crumbs and melted butter.
Press into the bottom of the prepared pan and place in the freezer while you make the filling.
In a large bowl beat the whipping cream and 1/4 cup of the powdered sugar until stiff peaks form.
In a separate bowl beat together the cream cheese and remaining powdered sugar (3/4 cup) until soft. Then beat in the sour cream, melted chocolate and vanilla extract.
Mix the whipping cream into the cream cheese mixture until evenly combined.
Spread the filling overtop of the Oreo cookie crust and place the cheesecake in the fridge for at least 4 hours to harden.
Notes
*Recipe can be doubled and made in a 9x13 inch pan. **Store leftovers in an airtight container in the fridge.