Has anyone ever tried replacing the butter in a cookie recipe with white bean puree? Or how about with butternut squash or sweet potato puree? I'm looking for a few successful recipes that don't end up too "cakey". I still want good cookie texture and of course flavor. No applesauce substitutions please, but let me know if you have any other interesting subs. Thanks in advance. I'm a cookie snob, so it can't just taste good for low fat - in has to taste good - end of story. Know what I mean!