Marinate the Beef:

In a bowl, combine the thinly sliced beef with soy sauce, cornstarch, and sesame oil. Mix well and let it marinate for at least 15 minutes.

Prepare the Noodles:

If using dried rice noodles, soak them in warm water until they are soft, then drain. If using fresh noodles, separate them gently with your hands. Set aside.

Cook the Beef:

Heat 1 tablespoon of vegetable oil in a wok or large frying pan over high heat. Add the marinated beef slices and stir-fry until they are just cooked through. Remove the beef from the wok and set aside.

Stir-Fry the Noodles:

In the same wok, add another tablespoon of vegetable oil. Add the minced garlic and scallions, stir-frying for a few seconds until fragrant.

Add the rice noodles to the wok, tossing and stirring to prevent them from sticking. If the noodles start to stick, a splash of water can help loosen them.

Season the Dish:

Add the soy sauce, dark soy sauce, and oyster sauce to the noodles. Continue to stir and toss the noodles until they are evenly coated with the sauce.

Combine Ingredients:

Return the cooked beef to the wok, along with the bean sprouts. Toss everything together for another 1-2 minutes, ensuring the ingredients are well mixed and heated through.

Finish and Serve:

Drizzle a dash of sesame oil over the dish and give it one final stir. Serve hot, garnished with additional scallions if desired.