I found this recipe on one of my favorite food blog sites - SmittenKitchen.com. Deb has the best recipes and stories, and not necessarily in that order! These granola bars are wonderful because you can make them with what you want. I have not had any crumbling issues and I never make them with the same fruit and nuts twice. You can make oat flour by processing rolled oats until finely ground in a food processor. I always use almond butter and I also double the recipe - they are very popular in our house!