In a large pot, cook pasta to al dente. Drain in COLD water and set aside.
In a small bowl, whisk together peanut butter (slightly melted in microwave), soy sauce, vinegar, sesame oil, hot sauce and red pepper flakes.
In a large bowl combine veggies and noodles. Pour sauce over mixture and toss until well coated.
Top with green onion and sesame seeds.