01 - Cook the noodles according to package instructions until al dente. Drain thoroughly, rinse under cold running water to stop cooking and prevent sticking, then toss with a small amount of sesame oil. Set aside for stir-frying.
02 - In a small bowl, whisk together soy sauce, dark soy sauce, vegetarian oyster sauce, sugar, and white pepper until the sugar dissolves completely. Set the sauce mixture within reach for quick addition during cooking.
03 - Heat vegetable oil in a large wok or heavy skillet over high heat until shimmering. Add minced garlic and stir-fry vigorously for 30 seconds until fragrant, being careful not to burn it.
04 - Add sliced mushrooms to the hot wok and cook for 3–4 minutes, stirring frequently, until they begin to brown and release their moisture, concentrating their umami flavor.
05 - Add bell pepper, julienned carrot, and sugar snap peas to the wok. Stir-fry for 2–3 minutes over high heat until vegetables are crisp-tender and brightly colored.
06 - Add the cooked noodles to the wok. Pour in the prepared sauce and toss everything together with tongs or wooden spatulas for 2–3 minutes until well combined, evenly coated, and heated through.
07 - Stir in most of the sliced spring onions, reserving a portion for garnish. Toss briefly to distribute evenly.
08 - Divide the chow mein among serving bowls immediately. Top with toasted sesame seeds and reserved spring onions or fresh coriander. Serve hot while the vegetables retain their crisp texture.