01 - Preheat oven to 325°F. Grease a 9-inch springform pan and line the base with parchment paper.
02 - Combine graham cracker crumbs, melted butter, and sugar in a bowl. Press the mixture firmly and evenly into the bottom of the prepared pan. Bake for 10 minutes, then remove and let cool slightly.
03 - Beat cream cheese with an electric mixer until smooth and creamy. Add sugar and beat until fully incorporated. Add eggs one at a time, mixing well after each addition. Blend in sour cream, vanilla, flour, and salt until just combined — avoid overmixing to prevent cracks.
04 - Pour the filling over the cooled crust. Gently tap the pan on the counter to release trapped air bubbles. Bake for 50 to 60 minutes until the center is slightly set but still has a gentle jiggle.
05 - Turn off the oven and crack the door open. Let the cheesecake rest inside the cooling oven for 1 hour to prevent sudden temperature changes that cause cracking.
06 - Transfer the pan to a wire rack to cool completely. Refrigerate for at least 4 hours, preferably overnight, for the best texture and clean slicing.
07 - Whisk together sour cream, powdered sugar, and vanilla until smooth. Spread evenly over the chilled cheesecake before serving.
08 - Use a hot, wet knife to slice clean portions. Dip and wipe the blade between each cut for the neatest results.