I made the mac and cheese for this bento last night. It's not a throw together in the morning thing, because I wanted it to form a hockey puck rather than needing another container for it.
This is probably not going to be your favorite mac and cheese, but it might be your favorite New Year's Resolution Mac and Cheese - or almost mac and cheese. The sauce has sauted onions, mushrooms and garlic, and there's less cheese than usual. I divided it into 6 cups in a silicone muffin pan, topped with a little cheddar, and stuck under the broiler til the top was just browning. Sauted fresh bread crumbs in a little butter, added a little parmesan, and packaged the crumb topping separately so it'll still be crisp when I eat it. Here's the recipe for this mac and cheese.