I was a former house chef for a sorority in the 90's for 4 years. At the beginning of each year I had a questionaire of different types of foods broken into categories. I also had questions of dietary/religious restrictions so I would be aware of those as well. A good part of my recipies came from Cooking Light magazine because I knew my girls wanted to eat healthy. Maybe the house manager could get a survey from all the girls on meal plan and present that to the chef to give them some foundation. I only did dinner 6 nights but they had breakfast food as well. It is challenging to come up with different menus 6 nights a week and in my case for 22+ girls. Even though I would get in a rut occasionally I would try to keep it tasty and different. Sounds like to me your house chef gets slightly lazy after a time
or not just too motivated. It is hard but they have to try.