Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
Lightly flour a work surface. Roll out the puff pastry and cut it into equal-sized triangles.
Spoon a small amount of Nutella onto the wider end of each triangle. Sprinkle with ground hazelnuts, then roll up into a croissant shape.
Place the croissants on the prepared baking sheet, ensuring the seam is facing down to prevent them from opening during baking.
Whisk together the egg yolk and milk. 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 golden brown and crispy.
Melt the dark chocolate with the heavy cream. Once the croissants have cooled slightly, drizzle the melted chocolate over them.
Sprinkle the tops with powdered sugar and ground hazelnuts, and serve immediately.
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