This place is inside the 99 Ranch Market at the Chinese Cultural Center. When you walk in, make a right and keep going. Make sure you don't go to the "combo plate" steam table area -- Taiwan Express is in the corner.
You order at the counter and wait about five minutes. The chicken pancake is a psychoactive delight. Also try the whole fish (a special once or twice a week for five bucks!) and the boba teas.