Do you mean the school canteen or the dining room? If you provide food, it should be a restaurant. If you are a restaurant, you should use "cooking" instead of "ぉかず". Although "ぉかず" is an idiom, there is no need to use the passive here, just use the automatic word (~)

canteen

ごをべににきました.たくさんのぉかずがました.

restaurant

レストランにってをしました. I don't want to cook, but I don't want to eat either.