There are some casseroles that attempt to approximate an entire healthy meal in a single baking dish, maybe involving some rice and some chicken and some sensible broccoli. And then then, there are casseroles that are unapologetically creamy, meant solely to provide you a delicious helping of comfort out of a casserole dish. This is the latter. This easy casserole has only seven ingredients, but each one wholeheartedly plays its part in creating a seriously comforting and delicious bake.