02Meanwhile, put the black beans, agave, vanilla, espresso powder, and salt in a food processor. Add the chocolate mixture, and process 2-3 minutes - until the black beans are obliterated and the mixture is well-combined. Add almond flour (or coconut flour), flax meal, and baking soda. Process two minutes more. Fold in nuts & chocolate chips, if using.
03Pour the mixture into the greased baking pan. Bake for 40-50 minutes - until the top is set, but be careful about burning the edges. Allow to cool for at least an hour; otherwise, the brownies may be too gooey to slice.
04Store covered on the counter, or for a firmer brownie, in the refrigerator.