Maybe spring rolls. Fried rice. try Tempura and deep fry chopped vegetables and seafood. When I was younger I'd help make bao-zi, steamed buns with meat filling. Here's a link. you can do pork, chicken or beef. you can substitute Pillsbury dough for the bun and the kiddos can help put the filling in.
I am non-Asian, and egg fried rice is a winner for me, because it can include vegetables, seafood, and/or meat. Just use a good recipe with cold rice by a chef like Martin Yan or Grace Young (both Chinese).
I agree with the fried rice idea, fried noodles are usually a big hit with kids too. You could also make a noodle soup, kind of like a pho with rice noodles, meat balls, napa cabbage, beansprout, various meat and tofu...etc. They can kind of pick their own ingredients yum yum!