Prepare the noodles: Cook the noodles according to the package instructions. Drain and set aside.
Prepare the vegetables: Heat the vegetable oil in a deep skillet or wok over high heat.
Sauté: Add the onion and sauté for 1-2 minutes until it becomes translucent. Add the garlic and ginger, and sauté for another 30 seconds, stirring constantly.
Add the vegetables: Add the bell pepper, carrot, broccoli, and tomato to the skillet. Stir-fry for 4-5 minutes, stirring constantly, until the vegetables are crisp-tender.
Add sauces and seasonings: Add the soy sauce, teriyaki sauce, sesame oil, salt, and pepper. Mix well.
Add the noodles: Add the cooked noodles to the skillet and toss thoroughly to combine.
Serve: Transfer the prepared noodles to a plate and, if desired, garnish with green onions and sesame seeds.