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.
Melt the dark chocolate over a double boiler or in the microwave. Stir in the butter and Amaretto liqueur until smooth.
Spoon a small amount of the chocolate-Amaretto mixture onto the wide end of each pastry triangle. 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 unfolding during baking.
Whisk together the egg yolk and milk. Brush the mixture over the tops of the croissants for a beautiful golden-brown finish.
Sprinkle the sliced almonds over the tops of the croissants for added flavor and crunch.
Bake the croissants for 15-18 minutes, or until golden brown and crispy.
Let them cool slightly on a wire rack, then dust with powdered sugar before serving.
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