Preheat your oven to 350°F (175°C). This ensures that the brownies bake evenly.
In a food processor, add the drained and rinsed black beans. Blend until smooth. This will serve as the base of your brownie batter.
Add the large eggs to the food processor with the black beans. Blend until the mixture is well combined and creamy.
Next, add the coconut sugar, avocado oil, pure vanilla extract, and optional ground cinnamon. Blend until everything is incorporated.
In a separate mixing bowl, combine the unsweetened cocoa powder, baking powder, and sea salt. Mix well.
Pour the black bean mixture into the bowl with the dry ingredients. Stir until fully combined. The batter will be thick and fudgy.
Gently fold in the dark chocolate chips until evenly distributed throughout the batter.
Pour the brownie batter into a greased 9x9 inch baking dish. Spread it evenly with a spatula. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.
Allow the brownies to cool in the pan for about 10 minutes before slicing into squares. Enjoy your fudgy creation warm or at room temperature!