This frittata makes great use of leftover spaghetti. It has all of our favorite things like tomatoes, basil, and Parmigiano-Reggiano, and the extra protein from eggs. Use a good-quality egg that is lower in saturated fat. If you like spicy dishes, use the crushed red pepper flakes instead of the black pepper. Serve with a salad or fruit and you’ll have a high-protein, quick, and easy meal. You can also add vegetables such as asparagus or broccoli to this dish.