Dorie Greenspan's Blog stating it could be the cocoa powder causing the crumbliness. Dutch processed is preferred. She stated she had good results using the following brands of cocoa powder: Valrhona, Scharffenberger or Droste. Before I try again, I am definitely going to get new cocoa powder. I will keep you posted on the outcome. This recipe can be found on pages 402-403 in "Around My French Table."