Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
On a lightly floured surface, roll out the puff pastry and cut it into equal-sized triangles.
In a bowl, mix the hazelnut spread with the heavy cream until you have a smooth, creamy filling.
Spoon a small amount of the hazelnut cream filling onto the wider end of each pastry triangle, then roll them up into croissant shapes.
Place the croissants on the prepared baking sheet, making sure the seam is facing down to prevent them from opening during baking.
Whisk together the egg yolk and milk, then brush the tops of the croissants with the mixture to give them a beautiful golden-brown color.
Bake the croissants for 15-18 minutes, or until they are golden brown and crispy.
Melt the milk chocolate and, once the croissants have cooled, drizzle the chocolate over them.
Sprinkle with ground hazelnuts and powdered sugar, then serve.
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