Prepare the pastry

• Unroll the puff pastry on a lightly floured surface and cut it into equal squares.
• Spread Nutella over half of the squares, leaving a small border around the edges.

Shape the trees

• Top each spread square with a second square and press the edges to seal.
• Cut the stacked pastry into a Christmas tree shape, then make horizontal slits on both sides and twist each strip gently.
• Place the trees on a baking tray lined with baking paper and brush with beaten egg.

Bake

• Bake in a preheated oven at 200 °C until golden and puffed.

Finish

• Let the trees cool slightly, then dust with powdered sugar before serving.