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 the pastry into equal-sized triangles.
Sprinkle the pastry triangles evenly with dark chocolate and milk chocolate chips.
Spoon a little heavy cream onto the wider end of each triangle for an even richer flavor. Then, roll up the triangles into croissant shapes.
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 egg wash to achieve a beautiful golden-brown color.
Bake the croissants for 15-18 minutes, or until golden brown and crispy.
Melt the butter. Once the croissants have cooled slightly, gently brush the tops with the melted butter for added shine and flavor.
Dust the tops with powdered sugar and serve.
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