In a small saucepan warm the Spicy Peanut Sauce over moderate heat and add chicken.
In a kettle of boiling salted water cook pasta for 8 minutes. Add sliced carrots for cooking pasta, stir and cook for 1 minute. Add the broccoli, stir and cook for 30 seconds. Add the snow peas, stir and cook for another 30 seconds. Drain the pasta and vegetables in a colander.
Transfer the cooked pasta and vegetables to a bowl and pour the sauce/chicken mixture over, tossing to combine. Sprinkle with scallions and red pepper.