Preheat oven to 400℉ (205℃).
Unfold puff pastry and place on a lightly floured surface.
1 Sheet Puff Pastry
Roll pastry so it is a 8" x 10" rectangle.
Using a heart cookie cutter, cut out twelve 2" hearts from the pastry.
Place egg in a bowl and whip well.
1 Large Egg, lightly whipped
Fill the center of 6 of the hearts with the chocolate hazelnut spread. Brush the edges with the whipped egg (note - brushing with the whipped egg will seal the pastry and prevent it from separating during baking)
⅓ Cup Chocolate Hazelnut Spread
Place an unfilled heart over the heart filled with the hazelnut spread. Seal the edges by crimping with a fork.
Lightly brush the top of each heart with the egg wash. Sprinkle with granulated sugar.
1 teaspoon Granulated Sugar
Using a knife, create a small slit in the top of each heart (this will allow steam to escape).
Bake for 8 - 10 minutes. Pastries will be golden brown and risen.
Allow pastries to cool. Sprinkle with powdered sugar and drizzle with melted chocolate.
¼ Cup Chocolate, 1 Tablespoon Powdered Sugar