Cook the yakisoba noodles according to package instructions. Drain and set aside.

Prepare all vegetables and protein by slicing them into thin pieces.

Heat the wok over medium-high heat and add sesame oil.

Add the protein (if using) and stir-fry until cooked through, about 5 minutes.

Add the broccoli, bell peppers, carrots, and green onions. Stir-fry for another 3-4 minutes until vegetables are tender-crisp.

Add the cooked noodles, soy sauce, teriyaki sauce, ginger, and garlic. Toss everything together and stir-fry for an additional 2-3 minutes.

Serve hot, garnished with additional green onions if desired.