Cream- and cheese-based casseroles,

or those topped with cheese, bacon, fried onions, or buttered crackers. Who doesn't love the traditional hash brown casserole, gooey with cheese and potatoes? But brace yourself, because one serving has 568 calories, 40 grams of fat and 21 grams of saturated fat -- and this is for a side dish! Creamed, scalloped, and au gratin dishes may start out with healthy ingredients like broccoli, green beans, or potatoes. But when you add cream, butter, and canned soups and top them with cheese, bacon, and/or fried breadcrumbs, you can easily quadruple the calories. "Shave calories by substituting low-calorie mix-ins such as fat-free sour cream, low-fat cheese, or reduced-fat soups," says American Dietetic Association spokeswoman Suzanne Farrell. For a tasty, healthy side dish, try oven-roasted vegetables -- 6 ounces of oven-roasted new potatoes has just 100 calories and 4.5 grams of fat.