Under the overpass!
There are food additives, molds, boxes, etc. I have bought them. There is a good bakery called Shengda. It is in the northwest corner of the overpass. For baking sheets, ovens and other large appliances, go to Zhongheng Mall, which is at the long-distance bus terminal.
Southeast is the southeast of the intersection of Zhiluo Road and Beiyuan Street. It is very conspicuous and is located on the first floor of the East District where the hotel supplies are baked.
On Himalayan audio radio, Cai Lan launched a program called "Eat, have fun and be good". Mr. Cai Lan is an energetic old playboy who has always been partial to food and women.