Recipe - Black Bean Brownies

Today in Columbus it's grey and we're having "freezing rain", which in England is hail, but maybe that's not used here? Are they different things? Anyway, it's gloomy. One of my best friend's Brombley (read his blog here - it's beautiful) messaged me about something he had baked, that was low carb, GF & vegan and told me I HAD to try making them at some point - I figured why wait (especially as I had all the ingredients in my house), so today I also made Black Bean Brownies.