This recipe is loosely based on the marvelous peanut butter sandwich bread from 24/7 Low Carb Diner (http://247lowcarbdiner.blogspot.com/2011/03/mr-peanut-sandwich-bread.html). Amazingly, it's got no flour or even flour substitutes, yet makes a wonderfully muffin-y muffin. It's blueberry season, so I put blueberries in - if you are on a very low-carb fruitless diet, just leave them out. The muffins will still be yummy.
I use stevia for a sweetener, but you can use other sweeteners to taste (honey works well, if you' re just doing gluten-free, not low carb.) If you use a granulated xylitol-based sweetener, dissolve it in a little bit of hot water first or it won' t blend in.