Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
Lightly flour a surface and roll out the puff pastry. Cut it into equal-sized triangles.
Break the shortbread cookies into small pieces, then mix them with the melted milk chocolate and heavy cream to create a smooth filling.
Spoon a small amount of the cookie-chocolate filling onto the wider end of each pastry triangle, then roll them up into a croissant shape.
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 mixture over the top of the croissants 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 with the butter. Once the croissants have cooled, drizzle the chocolate over them.
Sprinkle the tops with crushed cookies and powdered sugar. Serve and enjoy!
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