Easy Peppermint Black Bean Brownies

No Sugar, No Gluten, No Dairy. So how good can these brownies really be? Well let me just say that they are so good that my son (who hates black beans) has no idea that he is eating a brownie without any sugar, gluten or dairy and let alone has black beans. Then adding doTERRA peppermint essential oil to the batter makes it oh so good. You won't be able to...