01 - Preheat oven to 400°F. Line a large baking sheet with parchment paper and set aside.
02 - On a lightly floured work surface, unfold the thawed puff pastry sheet. Using a 3-inch heart-shaped cookie cutter, cut out 16 heart shapes. Arrange 8 solid hearts on the prepared baking sheet.
03 - Using a smaller 2-inch heart cutter, cut the centers from the remaining 8 hearts to create heart-shaped frames.
04 - Brush the edges of the solid hearts on the baking sheet with beaten egg. Gently place the heart frames on top, pressing lightly to seal the edges.
05 - In a small mixing bowl, combine softened cream cheese, granulated sugar, and vanilla extract. Beat with a fork or hand mixer until completely smooth and creamy.
06 - Spoon approximately 1 tablespoon of cream cheese filling into the center of each pastry shell. Top with 1/2 tablespoon strawberry preserves and arrange a few fresh strawberry slices on top.
07 - Brush the exposed pastry edges with remaining beaten egg for a golden finish.
08 - Bake for 16-18 minutes until pastries are puffed and deeply golden. Allow to cool on the baking sheet for 10 minutes.
09 - Whisk powdered sugar, milk, and vanilla extract in a small bowl until smooth and drizzling consistency. Drizzle generously over cooled pastries before serving.