Season 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 chicken to a bowl and set aside.
Whisk together all sauce ingredients and set aside. Crack eggs over a preheated 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 and bean sprouts. Add chicken and the sauce. Then add noodles, toss to coat the noodles in the sauce. Stir in green onions and coriander and garnish with peanuts if desired.