01 - Preheat the oven to 325°F. Line the bottom of a 9-inch springform pan with parchment paper and lightly grease the sides.
02 - Combine the graham cracker crumbs, melted butter, and sugar in a medium bowl until the mixture resembles wet sand. Press firmly and evenly into the bottom of the prepared pan. Bake for 10 minutes, then set aside to cool.
03 - In a large mixing bowl, beat the softened cream cheese with an electric mixer on medium speed until completely smooth and free of lumps. Gradually add the granulated sugar and continue mixing until well incorporated.
04 - Add the eggs one at a time, mixing thoroughly after each addition. Blend in the sour cream, vanilla extract, flour, and lemon juice. Mix until just combined—avoid overmixing to prevent air bubbles.
05 - Pour the filling over the cooled crust and smooth the surface with a spatula. Bake for 45 minutes, or until the edges are set but the center retains a slight jiggle.
06 - Turn off the oven, crack the door open, and let the cheesecake rest inside for 1 hour. This gentle cooling process helps prevent cracks from forming on the surface.
07 - Remove the cheesecake from the oven and allow it to cool completely to room temperature. Transfer to the refrigerator and chill for at least 4 hours, preferably overnight, before serving.
08 - Whisk together the sour cream, powdered sugar, and vanilla extract until smooth. Spread evenly over the chilled cheesecake just before serving.