Cook the Noodles:
Bring a large pot of water to a boil and cook the lo mein noodles according to the package instructions. Drain and set aside.
Prepare the Sauce:
In a small mixing bowl, whisk together soy sauce, oyster sauce, hoisin sauce, sesame oil, sugar, ginger, and garlic. Set aside.
Cook the Protein:
Heat 1 tablespoon of vegetable oil in a wok or large skillet over medium-high heat. Add your chosen protein and cook until fully cooked and golden. Remove from the wok and set aside.
Stir-Fry the Vegetables:
Add the remaining tablespoon of vegetable oil to the wok. Toss in the carrots, bell peppers, broccoli, and snap peas. Stir-fry for 3–4 minutes, until the vegetables are tender but still crisp.
Combine Everything:
Return the cooked protein to the wok and add the cooked noodles. Pour the sauce over the mixture and toss everything together until well-coated and heated through, about 2 minutes.
Garnish and Serve:
Transfer the Lo Mein to serving plates. Garnish with sliced green onions and sesame seeds if desired. Serve hot.