Preheat oven to 170° c.
Whisk together sugar, coca, butter, eggs and vanilla until combined.
Fold in the Macadamia Flour Mix, add the nuts folding through the mixture evenly.
Spoon into a 24cm square cake tin lined with baking paper and bake for 30-35 minutes.
The mixture should still cling slightly to a skewer when tested. Cool brownie in the tin. Cut into squares, dust with icing sugar & serve.
Makes approx 16 pieces.