Boil a large pot of water; cook Chinese noodles for 1-2 minutes, stirring to unfold. Drain, rinse, and set aside.
In a small bowl, whisk together oyster sauce, sesame oil, and soy sauces. Set aside.
In a wok, heat vegetable oil over medium heat. Add onion slices and cook for 4-5 minutes until tender. Add garlic, continuing to stir for 1 minute as it becomes fragrant. Add carrots, bell pepper, and snow peas. Cook for 4-5 minutes until tender.
Add cooked noodles, sauce, and stir to coat. Continue to cook for 2 minutes until noodles are cooked through and sauce is distributed evenly.
