01 - Preheat oven to 325°F. Line the base of a 9-inch springform pan with parchment paper.
02 - Crush biscuits or graham crackers into fine crumbs. Combine with melted butter and sugar. Press firmly into the base of the pan. Chill for 10 minutes.
03 - Beat softened cream cheese and sugar until smooth. Gradually add sour cream, eggs one at a time, vanilla, flour, and lemon zest, mixing gently after each addition.
04 - Pour filling over crust and tap pan to remove air bubbles. Bake 50 to 60 minutes until center is set but slightly wobbly. Turn off oven, crack door, and let cool in oven for 1 hour.
05 - Remove cheesecake and cool completely at room temperature. Refrigerate for at least 4 hours or overnight.
06 - Combine berries, sugar, and lemon juice in a saucepan. Cook over medium heat 5 to 8 minutes until berries soften. Stir in cornstarch mixture and cook 1 to 2 minutes until thickened. Cool completely.
07 - Spoon the chilled berry topping evenly over the cheesecake before serving.