Many of her girlfriends don't work and some are really amazing cooks, but my wife who works full time doesn't feel like she has time to bake cookies or make three-bean salad or whatever. She simply knows the best places to pick those things up around town, transfers the food to plastic containers for transport, and labels it with a piece of tape that simply says something like "Paige's chocolate chip cookies".
Even though our friends by now have figured out the "secret" it still makes everyone happy. (Including me. I find cooking for others interesting, but I don't do it much anymore.)