01 - Combine sliced beef with soy sauce, oyster sauce, cornstarch, sesame oil, and black pepper in a bowl. Mix thoroughly and marinate for 15 minutes.
02 - Prepare noodles following package directions. Drain, rinse briefly under cold water, and set aside.
03 - In a small bowl, combine soy sauce, dark soy sauce, chili garlic sauce, brown sugar, and rice vinegar. Stir until blended.
04 - Heat 1 tablespoon vegetable oil in a large wok or deep skillet over high heat. Add marinated beef in a single layer and sear for 1 to 2 minutes until lightly browned. Remove and set aside.
05 - Add remaining 1 tablespoon vegetable oil to the wok. Stir-fry garlic, ginger, and the white parts of the spring onions for 30 seconds until fragrant.
06 - Add bell pepper, carrot, and snow peas. Stir-fry for 2 to 3 minutes until just tender.
07 - Return seared beef to the wok along with cooked noodles. Pour in the prepared sauce and toss over high heat for 2 to 3 minutes until fully combined and heated through.
08 - Remove from heat. Garnish with spring onion greens, toasted sesame seeds, fresh coriander, and lime wedges if desired. Serve immediately.