Preheat the oven to 170C(340F) fan-forced and line two baking trays with baking paper.
In the bowl of an electric mixer, beat the butter and sugar together until smooth, creamy and fluffy.
Add the golden syrup and egg yolk and continue to beat until everything is just combined.
Remove the bowl from the stand and stir in the dry ingredients.
Use a tablespoon of dough at a time and roll it into a ball.
Place the dough balls on the lined baking trays at least 5cm apart.
Flatten each one to about 2cm thick.
Bake the cookies for 15 minutes or until they start to turn golden.
Leave them on the trays to firm for about 5 minutes then transfer them to a wire rack to cool completely.
Store biscuits in an airtight container.