1. Heat oven to 325˚F
2. Mix Oreo crumbs and butter; press onto bottom of 9-inch un-greased springform pan. Bake for 10 minutes.
3. Beat cream cheese, sugar, flour and vanilla until blended. Add chocolate, mix well. Stir in chocolate chips.
4. Add eggs, one at a time, mixing on low until just blended. Pour over crust.
5. Bake 45 minutes, or until center is almost set. Cool 1 hour on wire rack. Use a knife to loosen around. Refrigerate 4 hours. Serve.