Add all of the ingredients to a food processor or blender and puree on high setting, stopping periodically to scrape down the sides with a spatula.
The mixture should ball up. If the mixture is not forming a ball, add an additional 1 tablespoon to 3 tablespoons water, a bit at a time. Once pureed, remove the mixture from the blender or food processor and place in the center of a sheet of wax paper. Form a ball and refrigerate overnight, for about 8 hours or more.
Remove from the fridge and flatten between two sheets of wax paper into a square. Cut into bars.
Note that it is helpful to put the bars in the wax paper into an 8 x 8" baking pan and then flatten into a square with your hands.