Set oven to 425 degrees F.
Set the puff pastry out to thaw if it's frozen.
Gather a cookie sheet, rolling pin, parchment paper, and a heart-shaped cookie cutter.
Roll out one sheet of puff pastry onto parchment paper.
Spread Nutella over the sheet of puff pastry.
Add a layer of raspberry jam over the Nutella.
Roll out the second sheet of puff pastry and place it over the other sheet, sandwiching the Nutella and jam between the two sheets.
Cut the heart shapes and transfer them to a parchment-lined cookie sheet.
Make the egg wash by beating one egg with a tablespoon of water.
Using a pastry brush, brush egg wash on each heart.
Bake for 10 min or until golden brown.
