Oh yeah, VERY IMPORTANT NOTE!! *Store these in the fridge.* It will be okay to keep these out on the counter for a day or so, but after that the beans start to get a little funky.
Lamecarrot, how's your blender? It's probably not ever going to be super smooth unless your blender is a good one. As for the flour, Birdperson said the she added a couple TB.
"Blackies" (Black Bean Brownies)