01 - Preheat oven to 400°F and line a baking tray with parchment paper.
02 - In a small bowl, blend cream cheese, granulated sugar, vanilla extract, and lemon zest until smooth and creamy. Set aside.
03 - In a separate bowl, toss diced strawberries with granulated sugar, lemon juice, and cornstarch until evenly coated. Set aside.
04 - Roll out puff pastry sheet and cut into 8 equal squares. Score a ½-inch border around each square, being careful not to cut all the way through.
05 - Place 1 tablespoon cream cheese filling in the center of each square and spread gently within the scored border.
06 - Spoon 1 tablespoon strawberry mixture over the cream cheese layer on each square.
07 - Combine beaten egg with milk and brush the pastry borders with this egg wash.
08 - Bake 18–22 minutes or until pastry is puffed and golden brown. Remove from oven and let cool slightly on a wire rack.
09 - For the glaze, whisk together powdered sugar, milk, and vanilla extract until smooth. Drizzle over cooled pastries if desired.