Cook the noodles to al-dente (1 minute less than what packet says; its never instant or 2 mins!) without the spice packet. Drain and reserve.
While the noodles cook, in a pan, heat oil to high and it almost start smoking. Lower heat to medium high, and, add the onions, chillies, garlic, carrots and broccoli.
Saute for 3-4 minutes until just softening but still crunchy.
Add sesame seeds, soy sauce, sriracha sauce, and the noodles and toss to combine.
