Pre-heat the oven to 160C (320F) fan-forced and line two oven trays with baking paper.

In the bowl of an electric mixer, beat together the butter and sugar until they are light and creamy.

Add the egg yolks and beat until combined.

Tip in the sifted flour, baking powder, salt and cream of tarter in two lots and mix until the dough is formed

Now add the chocolate and macadamias and mix them in.

Using one tablespoon of dough at a time, form the dough into balls and place them on the trays 3cm apart. Gently press them down with your fingers or the back of a spoon to make them 2-3cm thick.

Bake the cookies for 17-19 minutes or until golden.

Leave them to cool on the trays for 5 minutes before transferring to a wire rack to cool completely.