Season the chicken with salt and pepper to taste. Cook chicken in a large wok or pan over medium heat, stirring throughout until cooked through (about 6-8 minutes), transfer the chicken to a bowl and set aside.
Whisk together all the sauce ingredients and set aside. Crack eggs over a pre-heated pan (where you cooked the chicken) and allow to fry for about a minute, then break it up with a spoon and add the onions, bean sprouts, chicken, and the sauce. Then add the noodles, toss to coat the noodles in the sauce. Stir in green onions and coriander, and garnish with peanuts if desired.