Cook the glass noodles according to the package instructions. In a large saucepan, bring water to a boil, then add the glass noodles and cook for exactly 6 minutes. Once cooked, drain the noodles, rinse with cold water, and set them aside. (Optional: Toss the noodles with a teaspoon of sesame oil to prevent them from drying out or sticking, but this step can be skipped if you plan to stir-fry them immediately.)
In a small bowl, combine the stir-fry sauce ingredients: soy sauce, chicken broth, oyster sauce, sesame oil, brown sugar, cornstarch, and pepper. Mix well and set aside.
Heat a tablespoon of oil in a large skillet. Once hot, add the chicken strips and season with salt and pepper. Cook for 4-5 minutes until the chicken is fully cooked, then transfer to a plate and set aside.
In the same skillet, add the remaining tablespoon of oil. Add the onion, red bell pepper, carrots, and garlic, and stir-fry on high heat for 2-3 minutes. Add the cabbage and green onions, cooking for another 2 minutes.
Return the cooked chicken to the skillet and pour in the stir-fry sauce. Cook for about 2 minutes until the sauce thickens. Do a taste test and adjust any flavor issues.
Finally, add the cooked glass noodles and toss everything together until well coated in the sauce. Stir-fry for an additional 2 minutes.
Garnish with sesame seeds and chopped green onions. Serve the stir-fried glass noodles warm for the best flavor.