Set oven to 350F.
In a large bowl, mix together the dry ingredients.
Add the wet ingredients to a food processor or high-powered blender. Blend until smooth. Empty the contents into the bowl with the dry ingredients and mix together using a spatula. Fold in macadamia nuts and reserve some for topping.
Line a square 8×8 (or 9×9) baking pan with parchment paper, then pour in the batter.
Bake for at least 25 minutes or until the top is golden brown and you can pierce it with a fork and it comes out clean.
Let them cool in the baking pan for about 15 minutes, then you can remove, slice and enjoy!