Don't knock 'em brownies

I made sure to make these brownies when my husband was at school and then not tell him what I used to make them until after he enjoyed them. These are simply sugar and gluten free's  Chocolate Walnut Brownies (except I used peanuts) made with... black beans. What I love about them is that they are sweetened mainly by a ripe banana and agave nectar. I don't like sugar alternatives that leave that diet after taste in your mouth! I decided they needed a frosting though and instead of trying something new, I used a chocolate butter cream. So there went the sugar free. But I am determined to deem them as healthy because of those conspicuous beans.