01 - Cook chow mein noodles according to package directions. Drain thoroughly and rinse under cold running water to stop cooking and prevent sticking.
02 - Heat 1 tbsp vegetable oil in a large nonstick skillet or wok over medium-high heat. Spread cooked noodles in an even layer. Fry undisturbed 4–5 minutes until bottom becomes golden and crispy. Flip carefully and crisp opposite side 2–3 minutes. Transfer to serving plate and set aside.
03 - Whisk together soy sauce, oyster sauce, hoisin sauce, sesame oil, sugar, minced garlic, grated ginger, water, and cornstarch in a small bowl until cornstarch dissolves completely. Set aside.
04 - Wipe skillet clean. Heat remaining 1 tbsp oil over high heat. Add onions and carrots; stir-fry 2 minutes. Add bell pepper, mushrooms, and snow peas; stir-fry 3–4 minutes until vegetables are tender-crisp and vibrant in color.
05 - Pour sauce mixture over vegetables. Stir constantly 1 minute until sauce bubbles and thickens to glossy coating consistency.
06 - Stir in bean sprouts and half the spring onions. Toss just until combined and sprouts are heated through, about 30 seconds.
07 - Arrange crispy noodles on serving platter. Spoon vegetable mixture with sauce over noodles. Garnish with remaining spring onions, sesame seeds, and fresh coriander. Serve immediately while noodles remain crispy.