Cook the noodles in salted boiling water as per packet instructions, drain and rinse with cold water to stop the cooking and remove the stickiness. Drain well.
In a large wok or pan, heat 2 tbsp oil and add the chicken pieces along with half of the grated ginger and 1 tbsp soy sauce. Also season with salt and black pepper. Stir fry on medium heat till the chicken is cooked through. Remove and keep aside.
Add the remaining oil to the wok and when smoking hot, add the mushrooms. Sauté on high heat for a minute and then add the capsicum, chicken and remaining ginger.
Mix well and season with soy sauce, fish sauce and black pepper. Toss well and add the cooked noodles. Toss well on high heat.
Check seasoning and adjust salt if required.
Garnish with spring onions and serve hot.