1 family sized box brownie mix (just the powdered mix)
1 cup chocolate chips, optional
Pour brownie mix into a medium sized bowl. Pour black beans into a blender and blend until smooth. And it's best to make sure they are smooth. Nobody likes chucks of beans in their brownies. Ew! Pour pureed black beans into the brownie mix and stir until well mixed. Add chocolate chips and stir. Bake as directed on the back of the brownie mix box.
Recipe adapted from my neighbor Tiff.