Preheat Oven:

Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.

Prepare the Puff Pastry:

Roll out the thawed puff pastry sheet on a lightly floured surface into a 12-inch square. Cut the sheet into 4 equal rectangles.

Add the Chocolate:

Place 1–2 tablespoons of chocolate near one short edge of each rectangle. You can use chocolate chips, broken chocolate bars, or even chocolate hazelnut spread.

Roll the Croissants:

Starting from the edge with the chocolate, roll the pastry tightly into a log. Place the rolled pastries seam-side down on the prepared baking sheet.

Egg Wash:

In a small bowl, whisk together the beaten egg and milk. Brush the tops of the pastries with the egg wash to create a golden, shiny finish.

Bake:

Bake the pastries in the preheated oven for 15–18 minutes, or until they are puffed and golden brown.

Cool and Dust:

Allow the pastries to cool slightly on the baking sheet before dusting them with powdered sugar for an elegant touch.

Serve:

Enjoy warm for the ultimate experience, as the chocolate inside will be perfectly gooey.