It's just not that good. Nothing crumbly about the base, more like goopy.

Absolutely delicious, but didn't come out as described. The part that was supposed to be crumbly had more of the consistency of cake batter. I'm not sure if the ingredients are listed wrong, but there's no way that with the amount of dry ingredients listed, it would come out crumbly. So I poured around half of it, maybe a little more, into the pan, then poured in the chocolate mixture. Then, I dotted the top with the conserved half. A good way of doing it is to scoop out bits with a teaspoon and dot it around on top. After it was all on top, a carefully spread it out. No matter how careful you are, you're bound to get a little of the chocolate mixed in. Don't worry, that's good. It gives it a beautiful marble look. I like the way it ended up looking a lot better than the way it looks on the picture, in fact. It looked delicious and got rave reviews. It's already been rerequested!

Tastes great. My version didn't come out with the crumbly layer on top, but it was still praised quite a bit!