If you're dreaming of a big scrumptious casserole, but worried about the calories, these recipes are just what you need. Each one of these casseroles has less than 400 calories per serving, but none of them skimp on flavor. By using a few clever ingredients like ground turkey instead of beef, less cheese, and more veggies, you can still enjoy a hearty casserole without ruining your diet. Check out some of our best low calorie casseroles!