Tilt the pan in a circular motion to coat the bottom of the noodles with the oil. Cook for 3-4 minutes. Flip the noodles using a large spatula and drizzle another tablespoon of oil. Tilt the pan to coat the noodles.
Add noodles back & break them. Add dark soy sauce, oyster sauce, dark brown sugar, red pepper flakes, beans sprouts, green onions, black pepper and salt to taste to the pan and toss well to coat the noodles with the sauce.