Preheat the oven to 300°F (150°C).
Toast macadamias in the oven for 10 minutes. Stir once to prevent burning.
Let them cool before processing.
Place the toasted macadamias into the bowl of an s-blade food processor. Add a pinch of salt. Start processing.
Pulse for a couple of minutes until the nuts turn into runny butter. You might need to scrap the sides of the bowl every now and then.
Add in orange oil, cocoa butter, and erythritol. Pulse for another minute or so. Use your taste buds to see if you need to add in a bit of anything.
Use it immediately or store in a fridge for up to a month.