How do you say "Cafeteria Workers"?
You can use 食堂师傅 as an informal way to refer to those cafeteria workers. Actually, you can use 师傅 every time you want to refer to someone with a skill, e.g.修车师傅(bike/car reparation worker). But here 师傅 has nothing to do with Master Shifu in Kungfu Panda. It is not like that Shifu :D