Cook the egg noodles according to package instructions. Drain and set aside.
In a large skillet or wok, heat the vegetable oil over medium-high heat. Add the sliced chicken and cook until browned and cooked through, about 5-7 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add the broccoli, bell pepper, and snap peas. Stir-fry for about 3-4 minutes until the vegetables are tender-crisp.
Add the minced garlic and grated ginger to the skillet, cooking for an additional 1 minute until fragrant.
Return the cooked chicken to the skillet. Add the cooked noodles, teriyaki sauce, soy sauce, and sesame oil. Toss everything together until well combined and heated through, about 2-3 minutes.
Serve hot, garnished with sesame seeds and sliced green onions.