Preheat oven to 400°F. Line a large baking sheet with parchment.
Unfold puff pastry on a lightly floured surface. Gently roll to even thickness.
Cut each sheet into 4 rectangles to make 8 pieces total.
Place a line of chocolate near one short edge of each rectangle.
Roll up tightly into a log, seam-side down. Tuck ends slightly to seal.
Brush tops with milk and sprinkle with coarse sugar if using.
Bake 18–22 minutes until puffed and deeply golden.
Cool 5 minutes on the pan. Serve warm or at room temperature.
Notes
Variation: Spread a thin layer of hazelnut spread or sprinkle orange zest with the chocolate for a twist. For extra shine, swap the milk wash for a beaten egg. Storage: Keep leftover croissants in an airtight container at room temperature for 1 day; re-crisp in a 350°F oven for 5 minutes. Freeze unbaked, filled croissants on a tray, then bake from frozen and add 2–4 minutes.This recipe is an original creation inspired by classic Easy Chocolate Croissants flavors. All ingredient ratios and instructions are independently developed.