Prepare the chicken: In a medium bowl, whisk together the marinade ingredients: soy sauce, toasted sesame oil, cornstarch, and pepper. Add the chopped chicken pieces, and toss to coat evenly. Let it marinate while you prepare the other ingredients. This helps to infuse the chicken with flavor and tenderizes it.
Prepare the glass noodles: Soak the glass noodles in a bowl of hot water until they become tender, which takes about 8 to 10 minutes. Stir occasionally to prevent them from sticking together. Once tender, drain and rinse them under cold water. Toss with a teaspoon of toasted sesame oil to prevent them from sticking. Set aside.
Make the sauce: In a separate bowl, whisk together the sauce ingredients, including the oyster sauce, soy sauce, dark brown sugar, fish sauce, rice vinegar, and water. Set aside while you prep the veggies.
Stir fry the chicken: Heat 1 tablespoon of peanut oil in a wok or nonstick skillet over high heat. Once hot, add the marinated chicken and stir fry for about 4 to 5 minutes until it’s cooked through and no longer pink. Remove the chicken from the pan and place it on a plate.
Stir fry the veggies: In the same skillet, add another tablespoon of peanut oil. Once heated, add the onions and stir fry for about 3 minutes until they begin to caramelize. Then, add the cabbage, carrots, and red bell pepper and stir-fry for about a minute. Add the tomatoes, ginger, and garlic, and continue stir frying for 1 more minute, or until the vegetables reach a crisp-tender state. Remember, they will continue to cook when combined with the noodles.
Cook the eggs: Push the vegetables to the side of the skillet, making space in the center. Add a drizzle of oil into the center and pour in the whisked eggs. Scramble the eggs until they are fully cooked, then mix them into the vegetable medley.
Stir fry everything together: Return the cooked chicken to the skillet. Add the prepared glass noodles and the sauce mixture. Toss everything together until the noodles are evenly coated in the sauce and heated through. Adjust seasoning to taste, perhaps adding more white pepper if desired.
Serve: Once everything is combined and heated, remove it from the heat. Serve hot, garnished with chopped green onions and sliced chilies or chili sauce for an extra kick. Enjoy the colorful and flavorful dish!