Sift together the flour, baking powder and salt and set aside.

In a large bowl, cream together the butter and sugars.

Add the egg and vanilla extract and mix well.

Add the flour, baking powder and salt.

Use a wooden spoon to stir through the chocolate chips and macadamia nuts.

Chill the cookie dough in the fridge for an hour.

Pre-heat the oven to 320F / 160C .

Use a cookie scoop to drop balls of cookie dough onto a lined baking sheet (around 2 tablespoons of dough per ball). Arrange them around 3 inches apart, leaving plenty of space for them to expand and spread. I put 6-8 cookies per baking sheet.

Bake for around 12 minutes until golden brown.

Cool for a few minutes on the tray and then transfer to a wire cooling rack to cool completely.