01 - Combine crushed vanilla wafer cookies with melted butter in a bowl. Press the mixture firmly into the bottom of a 9x13 inch dish. Refrigerate while preparing the remaining layers.
02 - Add blueberries, granulated sugar, lemon juice, and water to a saucepan. Cook over medium heat until the berries burst. Dissolve cornstarch in a splash of water to form a slurry, then stir it into the berry mixture. Simmer until thickened, about 2 minutes. Remove from heat and let cool completely.
03 - Beat cream cheese with powdered sugar in a large bowl until smooth. Incorporate lemon zest and lemon juice, mixing until evenly combined. In a separate bowl, whip cold heavy cream to stiff peaks. Gently fold the whipped cream into the lemon mixture until just incorporated.
04 - Spread half of the lemon cream evenly over the chilled cookie crust. Carefully spread half of the cooled blueberry sauce over the cream layer. Repeat with the remaining lemon cream, then finish with the remaining blueberry sauce.
05 - Cover the dish tightly and refrigerate for at least 4 hours, or overnight for the cleanest slices and best texture.
06 - Spread whipped cream over the top layer. Garnish with fresh blueberries and a sprinkle of lemon zest before slicing and serving.