In the bowl of a large food processor fitted with an "S" blade, grind the cashews, almonds, cinnamon and salt until finely ground. Add in the pitted dates and vanilla and process again until the dough becomes very sticky. (Mine started to become a big ball in the food processor.)
Use a tablespoon to scoop the dough and roll it between your hands to make ball shapes. Arrange the balls on a plate or baking sheet lined with parchment paper, then place them in the fridge or freezer to set for one hour. Once the balls have firmed up a bit, store them in an airtight container in the fridge for up to two weeks.
Notes
Alternatively, you can press this dough into a loaf pan lined with parchment paper and cut it into bars, for a more authentic "Larabar."