Cook the chow mein noodles according to the package instructions. Drain and set aside.
In a small bowl, whisk together the soy sauce, oyster sauce, sesame oil, cornstarch, chicken broth, and sugar to create the chow mein sauce. Set aside.
Heat the vegetable oil in a wok or large frying pan over medium-high heat.
Add the minced garlic and ginger to the pan and stir-fry for about 30 seconds until fragrant.
Increase the heat to high and add the sliced chicken to the pan. Stir-fry for about 5-7 minutes, until the chicken is cooked through and no longer pink.
Add the sliced bell peppers, julienned carrots, and bean sprouts to the pan. Stir-fry for another 3-4 minutes until the vegetables are tender-crisp.
Pour the chow mein sauce over the chicken and vegetables. Stir well to coat and cook for an additional 2 minutes, allowing the sauce to thicken.
Add the cooked chow mein noodles to the pan and toss everything together until well combined. Season with salt and pepper to taste.
Remove from heat, add sliced green onions, and serve hot.