01 - In a bowl, combine the thinly sliced beef with 1 tablespoon soy sauce, cornstarch, and 1 teaspoon sesame oil. Mix thoroughly and let it marinate for 10 minutes.
02 - Cook the noodles following package directions. Drain and rinse under cold water to stop cooking, then set aside.
03 - In a small bowl, whisk together soy sauce, oyster sauce, chili garlic sauce, rice vinegar, brown sugar, and toasted sesame oil until combined.
04 - Heat a large wok or skillet over high heat and add 1 tablespoon oil. Stir-fry the marinated beef in batches for approximately 2 minutes each until browned but still tender. Remove beef and set aside.
05 - Add more oil to the wok if necessary. Stir-fry garlic and ginger for 30 seconds until aromatic. Add bell pepper, carrot, and sugar snap peas; cook for 2 to 3 minutes until just tender.
06 - Return the beef to the wok, add the cooked noodles and pour in the prepared sauce. Toss everything together thoroughly and cook for an additional 2 minutes to heat through.
07 - Stir in sliced spring onions. Plate the dish and garnish with sesame seeds, fresh cilantro leaves, and extra spring onions. Serve immediately while hot.