If you're using frozen clams, they should still all open but they're safe to eat if the shell was closed before they were frozen. For baked and stuffed clams — usually entailing a mix of ...

You probably won't need all the clam shells. Put the stuffed clams onto a tray and refrigerate for 30 minutes. Dredge the tops of the clams in the breadcrumbs and press so the breadcrumbs adhere.