01 - In a mixing bowl, combine crushed vanilla wafers and melted butter until evenly moistened. Press firmly into the base of a 9x13-inch baking dish to form a compact layer. Chill the dish in the freezer while preparing the other components.
02 - Using an electric mixer, beat softened cream cheese until smooth. Add powdered sugar, lemon juice, and lemon zest, mixing until homogeneous. In a separate bowl, whip cold heavy cream to stiff peaks, then gently fold into the lemon-cream cheese mixture. Spread the lemon filling evenly over the chilled crust.
03 - In a saucepan, combine blueberries, granulated sugar, and lemon juice. Cook over medium heat, stirring gently, until berries begin to release juices, about 4–5 minutes. Add the cornstarch slurry and cook, stirring, until the mixture becomes thick and glossy, 2–3 minutes longer. Remove from heat and let cool completely.
04 - Once cooled, spread the blueberry mixture evenly over the lemon cream layer in the baking dish. Ensure an even surface.
05 - Whip heavy cream with powdered sugar and vanilla extract in a clean bowl until stiff peaks form. Spread the whipped cream evenly over the blueberry layer. Sprinkle with lemon zest and garnish with fresh blueberries, if desired.
06 - Refrigerate the assembled dessert for at least 4 hours or overnight to set fully. Slice neatly using a sharp knife and serve chilled.