Add the cashews onto a baking sheet. Toast for 3 - 5 minutes until the cashews are golden brown.
Transfer the cashews to a food processor and process on high until smooth and creamy. Depending on your food processor, this could take anywhere from 10 - 20 minutes.
Once smooth, slice the vanilla bean in half lengthwise. Scrape out the seeds and add them to the food processor. Process again until incorporated.
Transfer your homemade cashew butter into a sealed container. Store in a cool dry place for 2 - 3 weeks.
Notes
Store in an airtight container in the cupboard for up to 3 weeks, in the fridge for up to 2 months, or in the freezer for up to 6 months.