In a food processor combine the dates, raisins, oats, and pumpkin seeds. Process until the mixture is crumbly.

Add the cocoa, salt, and vanilla. Process again, and let the processor run until the mixture begins to get sticky and form clumps.

Add the chocolate chips (if using) and pulse until a ball forms on the blade.

Remove the bowl and roll small scoops (about one tablespoon each) of the mixture into balls. Continue until all of the mixture is used.

Transfer to an airtight container in the refrigerator, where they will keep for a couple of weeks, or to the freezer, where they will keep for a couple of months.