Cook the rice noodles according to the package instructions.
Heat sesame oil in a large skillet over medium heat.
Add the sliced bell pepper, broccoli, and carrots to the skillet.
Incorporate snow peas and green onions, then sauté for another 2-3 minutes.
In a small bowl, mix soy sauce, maple syrup, rice vinegar, and cornstarch mixture.
Pour the teriyaki sauce over the vegetables, stirring well to combine.
Add the cooked rice noodles to the skillet, tossing to coat them in the sauce.
Serve hot, garnished with additional green onions or sesame seeds if desired.