I got this recipe from http://www.yammiesnoshery.com/2013/09/healthy-100-calorie-double-fudge-banana.html?m=1 
Instead of regular chocolate chips I used sugar free dark chocolate chips. This gave me more bang for my calorie bucks.
These muffins are amazing. I kept them in a container in the refrigerator and was able to eat them for snacks and even breakfast.
Count me in 