Mix nuts with desired additions and spread evenly on a parchment-lined pie plate or baking tray with sides. Sprinkle with salt if desired. Pour melted coconut oil over the mixture.Put the tray in the freezer for an hour. When the mixture has hardened, chop up the brain chips into small pieces. Store them in a jar in the freezer.Add the brain chips to any fruit or fruit whip (half an avocado and half a banana whipped together), or serve over yogurt.