Prepare noodles per packet directions.
Mix Sauce in a small bowl.
Heat oil in wok or large heavy based skillet over high heat.
Add garlic and chilli and cook for 10 seconds. Don't inhale - the chilli will make you cough!
Add onion, cook for 1 minute.
Add chicken and fish sauce, and fry until cooked, around 2 minutes.
Add green onion, noodles and sauce and cook for 1 minute until the sauce reduces and coats the noodles.
Remove from heat and immediately add basil, toss until just wilted, then serve immediately.