01 - Preheat oven to 400°F. Line a rimmed baking sheet with parchment paper.
02 - On a lightly floured work surface, roll out thawed puff pastry sheet. Using a 3-inch heart-shaped cookie cutter, cut 16 heart shapes. Arrange 8 solid hearts on the prepared baking sheet, spacing evenly.
03 - Using a smaller 2-inch heart cutter, cut centers from the remaining 8 hearts to create frames. Brush edges of solid hearts with egg wash, then carefully place frames on top, pressing gently to seal.
04 - In a small mixing bowl, combine softened cream cheese, granulated sugar, and vanilla extract. Beat with a fork until completely smooth and creamy.
05 - Spoon approximately 1 tablespoon cream cheese filling into the center of each heart frame. Top with 1/2 tablespoon strawberry preserves and arrange 2-3 thin strawberry slices on top.
06 - Brush pastry edges lightly with remaining egg wash. Bake for 16-18 minutes until deeply golden and puffed. Allow to cool on baking sheet for 10 minutes.
07 - Whisk powdered sugar, 1 tablespoon milk, and vanilla extract in a small bowl until smooth. Add additional milk 1/2 teaspoon at a time if needed to achieve drizzling consistency. Drizzle over cooled pastries.