Heat half of the oil in a wok over high heat. Add half the chicken and stir fry for 3 minutes or until golden brown and cooked through. Transfer to a bowl. Repeat with remaining chicken. Add the chilli to the wok, if desired and stir fry for 30 seconds . Return chicken to the wok with the teriyaki sauce and bring to the boil. Cook for 1-2 minutes or until heated through. Remove from heat.
Mean while cook the ramen noodles following packet directions, adding the snowpeas and zucchini in the last minute of cooking.
Divide the noodle mixture among serving plates. Top with chicken . Sprinkle with the coriander and drizzle the pan juices to serve.