Grind the cashews in your spice grinder or food processor. They will turn into a flour; if a few little chunks remain, not a problem - it will add some texture.
Place the dates in a bowl or in your food processor with the oil and vanilla. Mash with a fork, or combine with a food processor.
Add the ground cashews, cocoa powder, and salt, and mash or blend until everything is well-combined.
Stir / press in the chips and/or nibs.
Shape the mixture into balls or press it out onto a cutting board lined with parchment paper and gently cut into bars (big or small).
I prefer to store these bars in the refrigerator or freezer for optimum freshness, but they will keep at room temperature in an airtight container for at least a few days.
Notes
It is best to use dates that are fairly fresh. If your dates are a bit dry, you can soak them in water for 5 to 10 minutes, drain, and then add them to the recipe. This will reduce the shelf-life a little.
Recipe by Go Dairy Free at https://www.godairyfree.org/recipes/healthy-chocolate-fudge-bars