01 - In a mixing bowl, combine the crushed graham crackers or digestive biscuits with the melted unsalted butter. Stir until all crumbs are evenly moistened. Divide the mixture among 6 serving glasses or ramekins, pressing gently to create a uniform base.
02 - In a separate bowl, beat the softened cream cheese until completely smooth. Add powdered sugar, vanilla extract, and lemon zest if using, mixing thoroughly. In another clean bowl, whip the cold heavy cream until stiff peaks form. Gently fold the whipped cream into the cream cheese mixture until fully blended and no streaks remain.
03 - Spoon or pipe the filling over the prepared biscuit bases in each glass, smoothing the tops for an even layer.
04 - In a small bowl, toss mixed berries with granulated sugar and lemon juice. Allow the berries to macerate for 10–15 minutes until juices are released.
05 - Spoon the berry mixture evenly over each cheesecake layer. Transfer the assembled desserts to the refrigerator and chill for a minimum of 3 hours (or overnight) until set. Serve cold.