Step 1: Prepare the Sauce : In a small bowl, whisk together soy sauce, oyster sauce, Worcestershire sauce, ketchup, sugar, and sesame oil until smooth. Set aside.
Step 2: Prepare the Noodles : If using packaged yakisoba noodles, gently loosen them under warm running water and drain. If using dried noodles, cook them according to package instructions until just al dente. Drain and toss lightly in a teaspoon of oil to prevent sticking.
Step 3: Cook the Chicken : Heat 1 tablespoon of oil in a large skillet or wok over medium-high heat. Add the sliced chicken, season lightly with salt and pepper, and stir-fry until browned and cooked through (about 5–6 minutes). Remove the chicken from the pan and set aside.
Step 4: Stir-Fry the Vegetables : In the same pan, add another 1 tablespoon of oil. Sauté onion for 1–2 minutes until translucent. Add garlic, carrot, and cabbage. Stir-fry for about 3–4 minutes until the vegetables are just tender but still crisp.
Step 5: Combine Everything : Return the chicken to the pan. Add the noodles and yakisoba sauce. Toss everything together using tongs or chopsticks until the noodles are evenly coated in sauce and heated through (about 2–3 minutes). Taste and adjust seasoning with more soy sauce or a pinch of sugar if needed.
Step 6: Garnish and Serve : Sprinkle with chopped green onions, sesame seeds, and a little pickled ginger if desired. Serve immediately while hot.