While baking the chocolate cake, prepare the cheesecake mixture.
With the mixer on medium low, beat the cream cheese until there are no clumps.
Next, add in sour cream, eggs, sugar, and vanilla. Mix on medium low for another 2 minutes.
Wrap the bottom of the springform pan with heavy duty foil 3 times to prevent water from entering.
Place springform pan in a larger pan and fill with water ½ way.
Pour cheesecake mix on top of the chocolate cake. Place into the oven and bake for 50 mins. The cheesecake should be slightly jiggly in the center with no air bubbles on top.
Turn off the oven and crack the door open.
Leave the door open for 1 hour to allow the cheesecake to slowly come to room temperature.
Remove from the oven, and let cool another 30 mins on the counter.
Remove from the pan, remove foil, and allow the chocolate cake cheesecake to cool for 30 more mins then place in fridge for 4-6hours or overnight.
If adding buttercream to the top, do so once the cheesecake has been in the refrigerator for at least 6 hours. If your cheesecake has any condensation on the top, be sure to pack this dry with a paper towel before adding buttercream.
To pipe the buttercream on this cheesecake, I used a Wilton 3M piping tip.
Frosting was also placed around the outer edges of cake, and by using a rubber glove mini chocolate chips were replaced around the edges