Cook the dumplings from their frozen state; if you let them defrost before cooking, the wrappers will get soggy. Buy thin round wrappers, often labelled for gyoza, sui gau, or jiaozi.
When the gyoza are cooked, use a slotted spoon to scoop them and the broccoli into the noodle bowl. Top with as much of the cooking water as you like, mix well and serve.