Preheat over to 325F, spread macadamia nuts over a small baking sheet and toast for 5-8 min. Or, if you don’t want to use the oven, and you have one, use a air fryer for 5-8 min. It works so well. Halfway through cooking time, stop the fryer, and give the nuts a little shaky shaky. Leave to cool slightly, then roughly chop.