Success! Found chicken shen jen bao at NBC Seafood in Monterey Park, where they called them chicken fried buns. Not as big as the ones at Imperial Seafood in Concord, but they'll do. This was my first dim sum visit to NBC in probably two to three years, and I was pleasantly surprised at the quality. I think I'd put them up with Capital Seafood-Monterey Park for the best cart dim sum in town. However it's also pricey at 2.59/3/59/4.59, and an ordinary lunch for three came out to $54 including tip. That would keep me from coming here regularly.