Preheat the oven to 350 degrees
Combine all of the ingredients except chocolate chips and walnuts in a food processor. Blend until smooth
Using a spatula fold in the vegan chocolate chips and walnuts. Reserve a few chocolate chips for the top.
Line a brownie pan with parchment paper. Pour and extend the batter. Sprinkle extra chocolate chips over the top.
Cook the black bean brownies for 20 minutes. Let cool at least 10 minutes before serving.