I came across these cookies once by accident, and then spent hours looking for them later! This recipe is based one the one from Hannah Kaminsky's blog, BitterSweet (http://bittersweetblog.wordpress.com). These are vegan, gluten-free, and lower carb than most peanut butter cookies. If you're not calorie-counting, I'm sure Hannah's version is better. I just wanted to cut back a bit!
Edit: These cookies ARE crumbly. According to the original recipe, using chia seeds instead of flax makes a difference - which is a good option if you're trying to avoid gluten.