Frozen Spinach is healthier than fresh spinach, as frozen spinach keeps the nutrients packed inside when it is frozen. Spinach is rich in vitamins A, C and K, magnesium, iron and manganese.You can blend it into smoothies, add it to a pot of soup, fold it into a frittata, quiche, or egg casserole, add it to a stir-fry, make savory pancakes, toss it into pasta, add it to a grain bowl, blitz it into a pesto.