Preheat oven to 160°C fan forced and line 2 baking trays with baking paper.

Process butter, icing sugar and both flours together in a food processor until mixture resembles fine breadcrumbs.

Press mixture together until it forms a dough. Divide dough in two.

Roll out dough between 2 sheets of non-stick baking paper until 5 mm thick.

Using a star shaped cookie cutter, cut shapes from dough. Transfer to prepared trays. Bake for 30 minutes or until dry and firm but still pale. Transfer to a wire rack to cool completely.

In 2 small bowls microwave the chocolate in 30 second intervals until melted, stirring in between.

Decorate the shortbread stars using the chocolate and any other desired decorations. Let the chocolate set before serving.