Preheat oven to 350 °F. Toast 1 c unsalted macadamia nuts if desired.
Whisk 2 c ap flour, 1 c cocoa powder, 1 tsp baking soda, ½ tsp baking powder, ½ tsp salt
Mix 1 c unsalted butter 1½ c brown sugar, ½ c granulated sugar
Add 2 large eggs and 2 tsp vanilla extract to wet mixture
Mix dry ingredients into wet ingredients
Fold in 1½ c white chocolate chips and 1 c unsalted macadamia nuts
Scoop 2 tsp balls of cookie dough, spacing at least 2 inches apart on baking sheet. Bake for 8-12 minutes. For a chewy cookie be sure to let the centers of cookies look soft and underbaked, but make sure the edges are set. The cookies will finish setting while cooling.