01 - Preheat oven to 400°F (200°C) and line a baking tray with parchment paper.
02 - In a small mixing bowl, thoroughly blend softened cream cheese with granulated sugar, vanilla extract, and lemon zest until smooth and creamy. Set aside.
03 - In a separate bowl, combine diced strawberries, granulated sugar, lemon juice, and cornstarch. Mix gently to coat the berries. Set aside.
04 - Unroll puff pastry and cut into 8 equal squares. Using a sharp knife, lightly score a ⅜-inch border around each square, being careful not to cut through.
05 - Spoon 1 tablespoon of cream cheese filling into the center of each pastry square, spreading gently within the scored border. Top each with 1 tablespoon of strawberry mixture.
06 - Beat the egg with 1 tablespoon milk. Using a pastry brush, apply the egg wash to the pastry borders for a golden finish.
07 - Bake on prepared tray for 18–22 minutes, or until pastry is risen and golden brown.
08 - Transfer pastries to a wire rack. Allow to cool slightly before glazing or serving.
09 - For the glaze, whisk powdered sugar, 2 to 3 teaspoons milk, and vanilla extract until smooth. Drizzle over cooled pastries if desired.