1. Place egg white (1) into the clean bowl and insert whisk attachment. Mix Speed 2 / 30-60 seconds, ensuring egg white is frothy.
2. Add icing sugar (180g) to the bowl. Mix Speed 2 / 15 seconds.
3. Place a little icing sugar into a bowl with a drop of yellow colouring. Mix to combine.
4. Place icing onto one of the large stars. This will top your tree.
5. Divide the remaining icing between three bowls and tint with green colouring to make three different shades.
6. Allow to sit and firm up for 5 minutes.
7. Ice remaining stars with the icing. Be creative!
8. Allow icing to set.

Assembly:

1. To assemble, place your yellow star towards the top of the serving tray.
2. Using the bigger size shortbreads, form the shape of a Christmas tree.
3. Use smaller stars to fill the gaps and to sit on the bigger shortbreads to look like little decorations.
4. Serve.