Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
On a lightly floured surface, gently roll out the puff pastry and cut it into equal-sized triangles.
In a bowl, combine the mascarpone cheese, powdered sugar, and a splash of coffee until smooth and creamy.
Spoon a dollop of the tiramisu cream onto the wider end of each pastry triangle. Roll them up into a croissant shape.
Place the croissants on the prepared baking sheet, ensuring the seam is facing down to prevent them from unraveling during baking.
Whisk together the egg yolk and milk, then brush the mixture over the tops of the croissants to give them a beautiful golden-brown color.
Bake the croissants for 15-18 minutes, or until golden brown and crispy.
Let them cool slightly, then dust with cocoa powder and sprinkle with grated dark chocolate before serving.
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