Make the sauce: Place all ingredients in a small bowl and stir until combined.
In a large pan, heat some olive oil and pan-fry the vegan chicken pieces until crispy. Set aside.
In the meantime, cook the noodles according to the instructions on the package. Set aside.
Cut the veggies. Cut the broccoli into small florets, the carrots and the bell pepper into thin strips, the green onions into rings, and finely chop the garlic.
In the same pan you used for the veggie chicken heat some sesame oil and cook the garlic and the green onions for 2 minutes on high heat. Stir a few times.
Then add the broccoli, the carrots, and the red bell pepper. Cook for 5 minutes on high heat. Then add the veggie chicken.
Add the cooked noodles and the sauce and stir well. Cook for 3 minutes on high heat until the noodles are a bit crispy.
Sprinkle with sesame seeds and red pepper flakes (optional). Serve immediately.