Preheat the oven to 350 degrees F and line a 8" x 8" pan with parchement paper (or lightly oil it).
Open the can of garbanzo beans and drain it into a colander. Rinse the beans under cool water. Shake the garbanzo beans around to remove any excess water, then transfer them to a high-powered blender.
Add the remaining ingredients for the brownies the blender and blend until a smooth brownie batter forms.
Pour the brownie batter into the prepared baking pan and bake for 24 to 26 minutes or until brownies test clean.
Allow brownies to cool for at least 20 minutes before cutting and serving.