Raise temp to 350.
Beat the cream cheese, sugar and cocoa.
Add sour cream and vanilla.
Add eggs one at a time. Scrape sides down as needed.
Pour over crust. Place in water bath or moat and bake 50 minutes.
Shut oven and crack door letting cheesecake cool down 10 minutes.
Remove to counter to cool and then chill.
Once cool, remove sides and place on platter.