I've had the links for a while but hadn't tried them. The 2 recipes are very very similar: http://annies-eats.com/2011/06/20/diy-oreos-and-a-giveaway/, http://www.cupcakeproject.com/2009/02/oreo-cookies-made-from-scratch-just.html
I used reg unsweetened cocoa powder (like the second) but just hand-formed the cookies (like the first). I made them a little too big, but it certainly wasn't a bad thing! They were pretty crisp, def not cakey. If you're an Oreo purist, you will not think they're a replacement, but they were a VERY good chocolate sandwich cookie-- and with normal ingredients and easy instructions!