Place cashews, nutritional yeast, and salt (if using) into a mini bullet blender or mini food chopper.
Process into a crumbly parmesan cheese consistency. Pulse a few times and shake to redistribute the mixture. Repeat until you achieve the desired consistency. See Notes below.
Notes
When processing in a mini bullet blender, be careful not to over-process, because it will turn into cashew butter. Store in an air-tight container in the fridge for up to 4 weeks.