Creating this cheesecake involves several steps, from preparing the crust to baking the filling and assembling the topping. Follow these instructions to achieve the best results:

Step 1: Prepare the Crust

1. Preheat your oven to 325°F (163°C).
2. In a medium bowl, mix together the graham cracker crumbs, sugar, and melted butter until well combined.
3. Press the mixture firmly into the bottom of a 9-inch springform pan, ensuring an even layer.
4. Bake the crust in the preheated oven for 10 minutes. Once done, remove it from the oven and let it cool while you prepare the filling.

Step 2: Make the Filling

1. In a large mixing bowl, beat the softened cream cheese and sugar together until smooth and creamy.
2. Add the lemon zest, lemon juice, and vanilla extract, mixing until fully incorporated.
3. Beat in the eggs one at a time, ensuring each egg is fully mixed before adding the next.
4. Gently fold in the sour cream and flour until the mixture is smooth and lump-free.
5. Pour the filling over the cooled crust in the springform pan.

Step 3: Bake the Cheesecake

1. Place the cheesecake in the oven and bake for 50-60 minutes, or until the edges are set and the center is slightly jiggly.
2. Turn off the oven and leave the cheesecake inside with the door slightly ajar for 1 hour. This gradual cooling helps prevent cracks.
3. Remove the cheesecake from the oven and let it cool to room temperature before refrigerating for at least 4 hours or overnight.

Step 4: Prepare the Topping

1. In a small bowl, combine the sour cream, sugar, vanilla extract, and lemon zest, mixing until smooth.
2. Spread the topping evenly over the chilled cheesecake.