Boil a large pot of water and cook the lo mein noodles according to package instructions.
Drain, rinse with cold water, and toss with 1 teaspoon sesame oil to prevent sticking.
In a small bowl, whisk together soy sauce, oyster sauce, hoisin sauce, sesame oil, sugar, black pepper, and cornstarch.
Set aside.
Heat 1 tablespoon vegetable oil in a large pan or wok over medium-high heat.
Add the sliced chicken and cook until no longer pink (about 4-5 minutes).
Remove from the pan and set aside.
In the same pan, add a little more oil if needed.
Add garlic and ginger, cooking for 30 seconds until fragrant.
Toss in carrots, bell peppers, cabbage, and snow peas. Stir-fry for 2-3 minutes until slightly softened.
Return the chicken to the pan.
Add the cooked noodles and pour the sauce over everything.
Toss well for 1-2 minutes, ensuring the noodles are evenly coated.
Garnish with chopped green onions and serve hot!