Our spinach casserole recipe uses a healthy amount of spinach and combines it with cream cheese and seasonings for a great side dish easily put together in 10 minutes. Although we use frozen spinach, you can also use fresh spinach (see our notes below). Spinach is filled with vitamins and minerals and is one superfood that you should incorporate into your diet on a daily basis. Very low in calories but high in nutritional content, spinach is a great and versatile ingredient; great eaten raw in salad and smoothies, it is delicious when cooked in soups or casseroles. Use fresh or frozen mixed greens, kale, or swiss chard instead of spinach if you want, and serve it alongside steak, fish, or chicken. Or use it as a veggie addition to a baked potato to offer it in a vegetarian meal.