I have tried to get my family to eat butternut squash, I think it is delicious, they do not. They loved these muffins though. I wish I had pictures, but we ate the entire batch in less than 24 hours.
When making the muffins be sure to note the comments, 1/2 pound of puree=1 cup. I roasted the squash in the oven along with a yam while we were eating dinner. It was much easier than peeling and chopping and I *think* it maintains more nutritional value.