01 - Preheat oven to 400°F. Line a rimmed baking sheet with parchment paper to prevent sticking and ensure even browning.
02 - On a lightly floured work surface, roll out thawed puff pastry sheet. Using a 3-inch heart-shaped cookie cutter, cut out 16 heart shapes. Place 8 solid hearts onto the prepared baking sheet, spacing them 2 inches apart.
03 - Using the remaining 8 heart cutouts, employ a 2-inch heart-shaped cutter to remove the centers, creating heart-shaped frames. Set aside.
04 - Lightly brush the edges of the solid hearts on the baking sheet with beaten egg wash. Carefully place the heart frames on top, aligning edges and pressing gently to seal the layers together.
05 - In a small mixing bowl, combine softened cream cheese, granulated sugar, and vanilla extract. Beat with a fork or electric hand mixer until completely smooth and well incorporated, approximately 1 minute.
06 - Spoon approximately 1 tablespoon of cream cheese mixture into the center well of each pastry frame. Top each with 1/2 tablespoon strawberry preserves, spreading carefully. Arrange 2 to 3 fresh strawberry slices on top of preserves.
07 - Brush the exposed pastry edges with a thin layer of remaining egg wash using a pastry brush. This promotes golden-brown coloration and proper puffing during baking.
08 - Bake for 16 to 18 minutes, rotating the baking sheet halfway through, until pastries are deeply golden, puffed, and the filling is set. The pastry layers should be fully separated and crisp.
09 - Remove from oven and allow danishes to cool on the baking sheet for 10 minutes. This cooling period sets the filling and prevents the glaze from melting completely.
10 - While pastries cool, whisk powdered sugar, 1 tablespoon milk, and vanilla extract in a small bowl until smooth and pourable. Add additional milk 1 teaspoon at a time if glaze is too thick for drizzling.
11 - Drizzle vanilla glaze generously over each cooled Danish using a spoon or piping bag. Serve immediately while pastry remains crisp, or allow glaze to set for 15 minutes before storing.