Cook the noodles according to package directions.
Combine the tamari/soy sauce, hoisin sauce, toasted sesame oil, and ¼ cup water in a bowl.
Cook the chicken, garlic, and chili flakes with butter in a large skillet over medium heat. Season with black pepper.
Add the mixed stir fry veggies and cook another 2-3 minutes.
Pour in the sauce. Bring to a low simmer.
Add the noodles and cook until the sauce coats the chicken and noodles.
Serve the noodles warm, topped with sesame seeds, baby basil leaves, and chopped green onions.
