I grew up in church, literally. My father, the minister, saw to it that the preacher’s kids never missed a gathering. Even when not a scheduled event, we were still in church cleaning, folding bulletins, or just hanging out. I credit my heritage for my expertise as a connoisseur of the all-American casserole. There’s just nothing quite like a potluck in the basement of a Baptist church to produce the finest, most authentic casserole cuisine. It’s easy to see why casseroles have fallen out of favor with the weight- and health-conscious crowd. One serving of some casseroles can harbor an entire week’s worth of carbs or Weight Watchers points. Luckily, it’s not difficult to trim the calorie count and step up the nutritional value of almost any casserole recipe around—even those typically laden with high-fat ingredients. You can make healthier versions that taste just as good. First, change the proportions …