Quick and Easy Beef Stew and Dumplings
The Dinty Moore recipe adds water to thin the stew so the dumplings will boil properly. Otherwise it will be difficult to get your dumplings to cook evenly as they won't sink into the thick stew and the stew won't have enough convection around them.

I would follow the Dinty Moore recipe including the dilution. 

Pillsbury calls for 25-30 minutes but that is in a slow cooker and your stew will be hotter than that. Check the dumplings after 10 minutes just to make sure they are done. Under cooked dumplings are not good memories.