In a large bowl, add pre-steamed egg noodles and boiling hot water to blanch the noddles for 1 min. Drain the noodles, quickly rinse with cold water, and set aside.

In a small bowl, mix soy sauce, dark soy sauce, oyster sauce, sugar, white pepper, sesame oil, and water. Set aside.

Heat a wok or large skillet over medium-high heat. Add the neutral oil, garlic, and onion. Stir-fry for 1 min until onions have softened.

Add the noodles and sauce mixture. Toss and stir-fry for 2–3 minutes until the noodles are evenly coated and heated through.

Add bean sprouts and scallions. Stir-fry for another 30 seconds just until they soften slightly. Add pinch of salt to taste.

Serve as-is or with chili oil and fried egg on top.