Cook the noodles according to the package directions. Drain and rinse briefly with cool water.
In a small bowl, whisk together the soy sauce, oyster sauce, hoisin sauce, sesame oil, brown sugar, rice vinegar, cornstarch, water, and black pepper.
Heat the vegetable oil in a large wok or skillet over medium-high heat.
Add the garlic and ginger and cook for about 30 seconds until fragrant.
Add the mushrooms, carrots, bell pepper, snow peas, and cabbage. Stir-fry for 4 to 6 minutes until the vegetables are crisp-tender.
Add the cooked noodles and pour in the sauce.
Toss everything together for 2 to 3 minutes until the noodles are evenly coated and the sauce thickens.
Stir in the green onions.
Garnish with sesame seeds and extra green onions before serving.