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.
Crush the Oreo cookies into small pieces, then mix them with the mascarpone cheese and powdered sugar to create a sweet, creamy filling.
Spoon a little of the Oreo mascarpone 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 unfolding 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 dark chocolate with the heavy cream. Once the croissants have cooled, drizzle the chocolate over them.
Sprinkle the tops with crushed Oreo cookies and serve.
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