01 - Preheat the oven to 325°F (160°C). Line the bottom of a 9-inch springform pan with parchment paper, lightly greasing the sides to prevent sticking.
02 - Combine the graham cracker crumbs, melted butter, and granulated sugar in a medium bowl, stirring 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 completely.
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, continuing to mix until well incorporated.
04 - Add the eggs one at a time, beating well after each addition to ensure even emulsification. Blend in the sour cream, vanilla extract, all-purpose flour, and lemon juice. Mix until just combined—avoid overmixing to prevent air bubbles.
05 - Pour the filling over the cooled crust, smoothing the surface with a spatula. Bake for 45 minutes, or until the edges are set but the center retains a slight wobble when gently shaken.
06 - Turn off the oven, crack the door open slightly, and let the cheesecake rest inside for 1 hour. This gradual cooling prevents sudden temperature changes that cause cracking.
07 - Remove the cheesecake from the oven and allow it to reach room temperature. Transfer to the refrigerator and chill for at least 4 hours, preferably overnight, until fully set.
08 - Whisk together the sour cream, powdered sugar, and vanilla extract until smooth. Spread evenly over the chilled cheesecake surface just before slicing and serving.