Line a baking sheet with parchment paper. 
 

Cut out 2 Galberts ready rolled flaky puff pastry sheets in the shape of a Christmas tree. Evenly spread your favourite chocolate spread on one sheet of the pastry. Place the other cut out sheet of puff pastry on top. 
 

Transfer to the baking sheet. Cut slits on both sides spacing them about 1-inch apart (or about 2 cm), leaving the centre intact. 
 

Twist each strip of pastry twice, pressing the ends into the baking sheet. Cut out two star shapes with the leftover pastry, spread one with chocolate spread and place the other on top. Place the star on the top of the tree. 
 

Brush the pastry with egg yolk mixed with a little water. Bake for 25-30 minutes at 200°C/fan 180°C until golden. 
 

Allow to cool for 5 minutes. Lightly brush pastry with the melted butter (you may not use it all), and sprinkle with cinnamon sugar.