So, I'm a streak eater, and last night I made the easy chicken and dumplings again. The night before, and on some previous occasions, I'll get one or two dumplings that don't puff up and end up being dough lumps. So, I noodled on it some and decided I'd do a couple things differently.
After I mixed the Bisquick and milk (1 cup, 1/3 cup) I let the dough rest for about 15 minutes thinking that might help get it hydrated better. Then, I rolled them into little balls about the size of a grape before dropping them in the broth (rather than dropping in fairly randomly sized and shaped spoonfuls). Thirdly, I put in fewer so they weren't as crowded in the pot. And D, I covered the pot for the entire time, rather than the 10 uncovered, 10 covered suggested on the box.
Well, the smaller, more hydrated, uncrowded balls puffed almost immediately and every one was perfectly cooked after 20 minutes covered.
There's another great tip from ness' Test Kitchen.