In a large bowl, combine oil, honey and vanilla and whisk together. Add oats, coconut and cashews and stir to coat. Add a bit of salt if desired.
Pour onto a rimmed cookie sheet lined with parchment paper and spread out evenly. Bake at 300 degrees for 35-45 minutes until golden brown. Stir about every ten minutes so that it bakes evenly.
Let cool, then store in an airtight container.