01 - Cook the chow mein noodles according to package directions. Drain thoroughly and rinse under cold water to stop cooking and prevent sticking.
02 - Heat 1 tablespoon vegetable oil in a large nonstick skillet or wok over medium-high heat. Spread cooked noodles in an even layer. Fry undisturbed for 4-5 minutes until bottom becomes golden and crispy. Flip carefully and crisp opposite side for 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 cornstarch dissolves completely. Set aside.
04 - Wipe skillet clean. Heat remaining 1 tablespoon oil over high heat. Add onions and carrots, stir-fry for 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 and stir constantly for 1 minute until sauce thickens and coats vegetables. Add bean sprouts and half the spring onions, toss to combine.
06 - 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.