Whisk together soy sauce, oyster sauce, sesame oil, and garlic powder in a small bowl and set aside for 1 minute.
Heat vegetable oil in a large skillet or wok over high heat for 1 minute until shimmering.
Add cabbage, carrots, and celery, and stir-fry for 3 minutes until softened but still crisp.
Add the noodles and sauce mixture, tossing constantly for 4 minutes until noodles are heated through and coated evenly.
Remove from heat and let rest for 1 minute before serving so the noodles absorb the sauce without turning soggy.