I'm not a professional chef, I'm a sysadmin. Cooking isn't part of my job description.

I don't want to be forced to eat food prepared by people who don't have food handlers' cards, and I don't want my coworkers to feel hurt because I don't want to eat what they cooked and left in their car.

Want to improve morale and do teambuilding? Get a cater, or go somewhere for lunch.