You can add any vegetables or proteins you like. Gently toss the noodles and sauce together so you don't break up the noodles. Check the noodles before you drain water to make sure they are at a desired doneness, a little underdone is okay because they will continue cooking when you add them to the pan of vegetable and egg mixture. Top with whichever herbs you like. Cilantro is my favorite and adds brightness to the dish.