01 - Cook chow mein noodles according to package directions. Drain thoroughly and rinse under cold water to stop cooking process and prevent sticking.
02 - Heat 1 tablespoon vegetable oil in large nonstick skillet or wok over medium-high heat. Spread cooked noodles in even layer. Fry undisturbed 4-5 minutes until bottom becomes golden and crispy. Flip and crisp opposite side 2-3 minutes. Transfer to plate and reserve.
03 - Whisk together soy sauce, oyster sauce, hoisin sauce, sesame oil, sugar, garlic, ginger, water, and cornstarch in small bowl until smooth and cornstarch dissolves completely.
04 - Wipe skillet clean. Heat remaining 1 tablespoon 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.
05 - Pour sauce mixture over vegetables. Stir constantly until sauce thickens and coats vegetables evenly, about 1 minute.
06 - Add bean sprouts and half the spring onions to skillet. Toss quickly to combine and heat through, about 30 seconds.
07 - Arrange crispy noodles on serving platter. Top with stir-fried vegetables and sauce. Garnish with remaining spring onions, sesame seeds, and coriander. Serve immediately while noodles remain crispy.