Black Bean Brownies

I've been curious about trying black bean brownies, and today I happened across a couple of recipes for them.
http://coffeebeankisses.blogspot.com/2011/01/black-bean-brownies.html
http://kingdomfirstmom.com/2011/03/healthy-black-bean-brownies.html
Both of these people are interested in cooking without gluten, so apparently the beans take the place of the flour. I am not concerned about gluten-free cooking, but rather low-fat cooking. I'm wondering if I can make regular brownies and substitute the black beans for the shortening? When I bought my bags of black beans and white beans at the dry-pack cannery a couple of weeks ago, I overheard the lady telling someone that you can substitute cooked white beans for shortening, cup-for-cup. I've been curious to try it ever since.
I hope to experiment with this concept this week, and as I do I'll share what I find.