In the chill of winter, comfort food is especially appealing. As an example of a meal makeover, here is an unconventional update of the comfort-food perennial favorite, macaroni and cheese. Instead of the usual cream sauce, this recipe uses an easy sauce made with frozen squash (an excellent source of beta carotene) and low-fat milk. Surprising? Yes, but it works! Whole grains boost fiber, while the delicious sweetness of caramelized onions complements the squash and cheese.