Pour the Sesame Oil (1 teaspoon), Dark Soy Sauce (1 tablespoon), Fish Sauce (1 teaspoon), Oyster Sauce (1 teaspoon), and Shaoxing Cooking Wine (1 tablespoon) in a small cup. Season with Salt (1 pinch), Ground Black Pepper (1 pinch), and Granulated Sugar (1 pinch). Stir well and set aside.
Pour half of the Vegetable Oil (1 1/2 tablespoon) in a large wok and place it over high heat. Once the oil is hot, add the cooked Egg Noodles (8 ounce) and fry for a couple of minutes until they start to crisp up lightly. Transfer the noodles to a plate.
Add the rest of the Vegetable Oil (1 1/2 tablespoon) to the wok together with the Onion (1). Stir fry the onion over high heat for 2 minutes.
Add the noodles back to the wok and drizzle with the soy sauce mixture.
Stir fry and toss the noodles well until the soy sauce is evenly divided and has colored the noodles.
Transfer the noodles onto plates and serve hot. Enjoy!