Boil 8 oz noodles according to package directions. Drain, rinse with cold water, and set aside.
Whisk 3 tbsp soy sauce, 2 tbsp oyster sauce, 1 tbsp sesame oil, and 1 tsp sugar in a small bowl.
Heat 1 tbsp avocado oil in a large wok over medium-high heat. Stir-fry 1 lb sliced chicken for 5 minutes until browned and cooked through. Remove and set aside.