Preheat the oven to 180°C (356°F).
Chop the macadamia nuts and white chocolate into bite-sized pieces.
In a bowl, cream together the butter and sugar until smooth.
Add the egg and mix well.
Sift in the flour, baking soda, and salt, then combine.
Add the white chocolate and macadamia nuts, and mix into the dough.
Scoop the dough onto a baking sheet one spoonful at a time.
Bake in the preheated oven for 12 to 15 minutes.