Cook the lo mein noodles according to package instructions. Drain, rinse under cold water, and set aside.
Heat 1 tablespoon of vegetable oil in a large wok or skillet over high heat.
Add the chicken strips and stir-fry until browned and cooked through, about 5 to 7 minutes. Remove the chicken from the wok and set aside.
In the same wok, add the remaining 1 tablespoon of vegetable oil. Stir-fry the broccoli, carrots, mushrooms, and bell pepper until crisp-tender, about 4 to 5 minutes.
Whisk together the soy sauce, sesame oil, and minced garlic in a small bowl to create the sauce.
Return the cooked chicken to the wok. Add the cooked noodles and pour the sauce mixture over the top.
Toss everything together continuously for 2 minutes until well combined and heated through.
Garnish with sliced green onions and sesame seeds, then serve immediately.