01 - Preheat oven to 325°F (163°C). Grease a 9-inch springform pan.
02 - Combine graham cracker crumbs, granulated sugar, and melted butter in a mixing bowl. Press mixture firmly into the bottom of the pan. Bake for 10 minutes, then allow to cool.
03 - Beat cream cheese and granulated sugar with a mixer on medium speed until smooth and creamy. Add eggs one at a time, blending well after each. Mix in sour cream and vanilla extract until just combined.
04 - Pour filling over cooled crust. Smooth the surface, then bake in the preheated oven for 55 to 65 minutes, or until center is almost set. Turn off oven, leaving cake inside with the door slightly ajar for 1 hour.
05 - Remove pan from oven and allow cheesecake to cool completely on a wire rack. Refrigerate at least 4 hours or overnight for optimal texture.
06 - Whisk sour cream, powdered sugar, and vanilla extract. Spread over chilled cheesecake before serving if desired.