Begin by preparing the sauce. In a small bowl, combine the oyster sauce, soy sauce, chicken broth, sesame oil, sugar, cornstarch, and white pepper. Whisk until smooth and set aside.
Cook the noodles according to the package directions. Once tender, drain and rinse under cold water to stop the cooking process and prevent sticking. Set aside.
Heat the vegetable oil in a large wok or deep skillet over medium-high heat. Add the sliced chicken and stir-fry for 5–6 minutes, or until it’s fully cooked and lightly browned on the outside.
Add the garlic, ginger, and mixed vegetables to the pan. Stir-fry for 2–3 minutes until the vegetables are slightly softened but still crisp, releasing their aroma and adding texture to the dish.
Toss in the cooked noodles and pour the prepared sauce over the mixture. Stir continuously, allowing the noodles to absorb the flavorful sauce and ensuring all the components are evenly coated.
Finish by garnishing with chopped green onions and serve the chow mein piping hot straight from the wok for best flavor and texture.