Preheat oven to 375° F. Line a baking tray with parchment paper and set it aside.
Unroll the pie crust rounds and thin them out with a rolling pin.
Using a heart shaped cookie cutter, cut out to 28 hearts. Place 14 hearts on the prepared baking tray as a base.
Place a teaspoon of strawberry preserve at the center of each heart-shaped base.
Cover each base with another heart-shaped cutout and repeat the process with the remaining pies. Seal the edges of the heart with the help of a fork.
Put a “X” at the center of the hand pie and place the baking tray in the freezer for at least 5 minutes.
Meanwhile, in a small bowl combine the egg and milk and whisk vigorously.
Brush the egg wash over the hand pies and sprinkle some sparkling sugar on top.
Bake the hand pies for 15 to 16 minutes until the edges start to turn golden. Serve them warm.