Preparation

Step 1: Prepare the Crust

1. Preheat your oven to 325°F (165°C) and grease a 9-inch springform pan.
2. In a medium bowl, combine graham cracker crumbs, granulated sugar, and melted butter. Mix until the texture resembles wet sand.
3. Press the mixture firmly into the bottom of the springform pan to create an even crust. Use the back of a spoon or a flat-bottomed glass for a smooth surface.
4. Bake the crust for 10 minutes. Remove from the oven and let it cool while you prepare the filling.

Step 2: Make the Blueberry Swirl

1. In a small saucepan, combine blueberries, sugar, lemon juice, and cornstarch.
2. Cook over medium heat, stirring frequently, until the blueberries break down and the mixture thickens (about 5-7 minutes).
3. Remove from heat and let the blueberry sauce cool to room temperature. If desired, strain the sauce to remove blueberry skins for a smoother texture.

Step 3: Prepare the Cheesecake Filling

1. In a large mixing bowl, beat the softened cream cheese and sugar together until smooth and creamy.
2. Add sour cream, lemon zest, and lemon juice, mixing until well combined.
3. Add the eggs one at a time, beating on low speed after each addition. This helps prevent air bubbles and ensures a smooth batter.
4. Pour the cheesecake filling over the prepared crust, smoothing the surface with a spatula.

Step 4: Add the Blueberry Swirl

1. Drop spoonfuls of the cooled blueberry sauce over the cheesecake filling.
2. Use a knife or skewer to gently swirl the sauce into the filling, creating a marbled effect. Be careful not to overmix—swirls should remain distinct.

Step 5: Bake the Cheesecake

1. Place the springform pan in the oven and bake for 60-70 minutes, or until the edges are set and the center is slightly jiggly.
2. Turn off the oven, crack the door open slightly, and allow the cheesecake to cool inside the oven for 1 hour. This gradual cooling helps prevent cracks on the surface.

Step 6: Chill and Serve

1. Transfer the cheesecake to the refrigerator and chill for at least 4 hours, or overnight for the best texture.
2. Before serving, garnish with fresh blueberries, lemon slices, or a dusting of powdered sugar for an elegant presentation.