Preheat oven to 350 degrees. Line a 8x8 baking dish with parchment paper.
Rinse and drain beans.
Add all ingredients except for the chocolate chips into a food processor and process until completely smooth and blended well together.
Pour the batter into prepared baking dish. Sprinkle with the chocolate chips, if using.
Bake at 350 for 25-30 minutes or until set.