Preheat the oven to 200°C (180°C fan) and line a large baking tray with baking paper.
Roll out the two sheets of puff pastry to make them a little larger than how they come. If you are using a block, roll out two large rectangles so they’re roughly the same size. Lay one sheet flat on the tray.
Spread a generous layer of Nutella evenly over the first pastry sheet, leaving a small border around the edges.
Place the second sheet of pastry on top to sandwich the Nutella layer. Press gently down to seal.
Using a sharp knife, cut out a large triangle shape (this will be your Christmas tree) with a small rectangular base for the trunk. Remove the excess pastry from around the edges. Set aside.
Starting from the base of the tree (triangle), make horizontal cuts about 2 cm apart on both sides of the triangle, leaving a central “trunk” uncut in the middle. Twist each strip gently 3 times to form the tree branches.
With the excess pastry, cut out a few decorations such as stars for the top of the tree or some circles to look like baubles. Place on the main tree as you like.
Brush the entire tree with beaten egg.
Bake for 20-25 minutes, or until puffed and deep golden brown.
Once cooled very slightly, dust with icing sugar. Serve warm.
The video below will help with this recipe.