Class 302 in Rowland Heights, sit in desks like the ones my parents used as kids in Taiwan, and order some classic Taiwanese bento and snack dishes. This place has amazing drinks and shaved ice desserts, too.
Be forewarned. The pigs blood is deceptively labeled as "rice cake with peanuts" or something in English even though the Chinese on the menu clearly indicates that it's pig's blood.
I mention a lot of food in Phoenix Mountain mainly because I have so much good food around me all the time. I think it's also a result of watching so much Japanese anime, a genre which often quiet scenes of tasty foods.