I got this Blueberry Muffin recipe from Janel in the Baking Exchange of 2013. I tried making it a couple times with my own all-purpose mixes and they flopped (as did a friend’s when she tried too). The recipe only seems to work with Namaste All-Purpose GF flour. The recipe is a little finicky for?
http://glutenfreedairyfreecalgary.wordpress.com/2014/02/06/blueberry-muffin-recipe/