Lower the temperature to 140c (280f). In a big mixing bowl, add the room temperature cream cheese, sugar, cinnamon, and vanilla extract and mix with an electric hand mixer until the cream cheese is creamy.
Add the sour cream and mix well.
Whisk the eggs with a fork, add them to the cream cheese batter, and mix until the mixture is creamy and smooth.
Sift the cornstarch into the mixture and mix until combined and there are no lumps of cornstarch showing.
Pour the cheesecake batter over the crust, and release air bubbles by gently tapping the pan onto a flat surface.
Bake the cheesecake in a 140c (280f) preheated oven for about an hour or until the edges of the cheesecake are set, but the middle is a bit jiggly.
Open the oven door halfway, and let the cheesecake cool to room temperature for 1-2 hours.
After the cheesecake is cooled, wrap the cheesecake with a plastic wrap tightly, and place the cheesecake in the fridge to cool completely for at least 5 hours.
Run a thin knife around the edges of the cake to loosen it from the pan. Carefully release the springform.
Top the cheesecake with the pecan topping and spread it evenly with a spoon.