A sweet treat of a snack bar that manages to pack in a little nutrition, too. Be sure not to over bake the bars. Pull them out when they're still a bit soft in the center. They will set up as they cool!
Preheat the oven to 350 degrees F. Line an 8x8-inch baking pan with parchment paper so that it drapes over two sides.
Put the chickpeas, peanut butter, and butter in the bowl of a food processor fitted with a metal blade. Run until very creamy and smooth. Add the brown sugar, egg, and vanilla and run again to blend. Add the whole-wheat flour, all-purpose flour, baking soda, and salt, and run until combined with no obvious streaks of flour. Scatter in the chocolate chips and mix them in with a spoon (it's a little awkward, but will save you cleaning another bowl).
Transfer to the baking pan and press with your hands to fill out the pan so the batter is smooth across the top.
Bake until the edges just begin to brown lightly and it's still a little soft in the center, about 16 minutes. Let cool for 20 minutes. Cut into 16 bars. Store in an air-tight container.