I used to watch my mom carefully roll them out and put them onto paper toweling for a half hour or so before dropping them into the simmering (not boiling!) broth. (cooked chicken set aside for later re-adding) It forms a small skin on them that keeps them together better. Then push them down with the back of a spoon to make sure all sides are wet. The tip not to overcrowd is spot on true! Cook until done.