Cut the chicken into thin slices and marinate with light soy sauce, cornstarch, baking soda, white pepper, sesame oil, and sugar. Mix well and set aside.
Prepare all the vegetables before heating the wok.
Boil the noodles according to the packet instructions. Drain and rinse with cold water. Set aside. (If using fresh noodles, skip this step.)
Combine the chow mein sauce ingredients in a small bowl or jar and set aside.
Heat the wok or pan over medium-high heat. Stir fry the marinated chicken and set aside.
Drizzle more oil in the pan and sauté garlic and onions. Add the hard vegetables first, followed by the soft ones like cabbage and spring onions.
Add the noodles to the pan and pour the sauce over them. Add the cooked chicken and toss everything together. Finish with spring onions.