This dish was developed for the *Make it Healthier Game* and based on 3KillerB's Recipe #208573. My sister in law's mother also makes a custard based macaroni and cheese so I was interested in the chance to work on a version that while not low-fat, certainly lower than most dishes of this sort. Use the sharpest cheddar or other cheese you can find for best results. The zucchini is a nice way to add extra volume to the dish without adding calories. If your family is averse to green, peel the zucchini first.