Add the vanilla and sour cream and beat until just incorporated.Pour the cheesecake mixture into the crust and even out the top. Bake in the preheated oven. Check after 50 minutes. The top should no longer be glossy and the center should still be jiggly. Turn off the oven and crack the door. Let the cheesecake sit in the oven for 30 minutes. Remove the cheesecake from the oven.Remove the springform pan sides, decorate the top, and serve.