possible addition: "baked!" like bread or pastry or stuff, though as I'm phrasing the square here, it could also be like baked potato

Perhaps "used oven"? And, accordingly, could also include "used slow cooker" as an option.

Hm, and maybe something for food that's not cooked - salads, sandwiches, all the stuff in my raw food uncookbooks. (That's at least two categories separately if we go that way.)