1. Prepare the Noodles: Cook the chow mein noodles according to the package instructions. Drain, rinse briefly with cool water if needed, and toss with a little oil to prevent sticking.
2. Season the Chicken: Place the sliced chicken in a bowl. Add 1 tablespoon soy sauce, a little black pepper, and half of the minced garlic. Mix well and set aside for 10 minutes.
3. Prepare the Sauce: In a small bowl, combine the remaining soy sauce, dark soy sauce, oyster sauce, brown sugar, black pepper, and sesame oil.
4. Cook the Chicken: Heat vegetable oil in a large wok or frying pan over medium-high heat. Add the chicken and stir-fry until fully cooked. Transfer to a plate.
5. Stir-Fry the Vegetables: Add the onion, remaining garlic, and ginger to the same pan. Cook briefly until fragrant. Add carrots, green beans, bell pepper, and cabbage. Stir-fry until slightly tender but still crisp.
6. Combine the Ingredients: Return the cooked chicken to the pan. Add the prepared sauce and mix thoroughly.
7. Add the Noodles: Add the cooked noodles and toss gently until they are evenly coated with the sauce and heated through.
8. Finish and Serve: Add chopped spring onions and toss once more. Serve hot as a complete meal.