Place the almonds in the container of a food processor fitted with the metal blade. Process until ground to a fine powder.
Add the dates, cocoa powder, vanilla, cinnamon, and half of the chocolate chips. Process until the mixture holds together as a mass—this will take a few minutes.
Add the remaining chocolate chips and pulse on and off for about 30 seconds. Add the walnuts and pulse on and off for another 20 to 30 seconds, or until finely chopped but still visible in the mixture.
Transfer the mixture to an 8 by 8-inch square pan. Press into the pan, using the back of a spatula to get it nice and even. Score the mixture into 12 squares.
Refrigerate for at least an hour before serving. Cover any leftovers and store in the refrigerator.
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