01 -
Preheat the oven to 325°F. Grease the base of a 9-inch springform pan.
02 -
In a mixing bowl, combine graham cracker crumbs, 1/2 cup granulated sugar, and melted unsalted butter. Stir until evenly moistened. Firmly press the mixture onto the bottom of the prepared pan and bake for 10 minutes. Allow the crust to cool.
03 -
With an electric mixer, beat softened cream cheese until smooth. Gradually add 1 1/4 cups granulated sugar and blend until incorporated. Mix in vanilla extract.
04 -
Add eggs one at a time, mixing at low speed after each addition until just blended. Fold in sour cream gently until incorporated and smooth.
05 -
Pour the cheesecake batter over the cooled crust. Smooth the surface with a spatula. Bake for 60 minutes, or until the center is set but still slightly jiggly.
06 -
Turn off the oven, crack the oven door, and let the cheesecake cool inside for 1 hour to prevent cracking.
07 -
In a saucepan over medium heat, combine blackberries, 1/4 cup granulated sugar, lemon juice, cornstarch, and water. Stir gently until the fruit softens and the mixture thickens and bubbles, approximately 5–7 minutes.
08 -
Remove topping from heat and let cool. Once the cheesecake is cooled, pour the blackberry mixture evenly over the surface.
09 -
Refrigerate for at least 4 hours or overnight. Once fully set, release the sides of the pan, slice, and serve chilled.