Well why not?! If you're going to make brownies from a box mix, vary it up a bit and throw in some healthy fiber for a change! Lynn, from The Actor's Diet, made "idiot-proof" brownies by adding in black bean-puree instead of eggs, water, and oil. She claims in this post here that it was quite the successful experiment!
I know Hungry Girl has a similar trick, but instead of bean-puree, she uses a can of pumpkin for a low-guilt, healthy, but goey batch of brownies. And finally, a friend of mine swears that all a good batch of brownie-mix needs is a bit of alcohol, like Makers scotch. Have you tried any of these ideas before? What do you think?!

Wow, fiber in my brownies looks healthy to me.
TYVM you’ve solved all my prombles