Cook the egg noodles in boiling water,according to the packet instructions, until just tender. Drain well.
Meanwhile, heat the oil in a wok or large frying pan. Add the peppers and stir-fry for 3-4 minutes. Add the spring onions and stir-fry for 1 minute. Add the noodles, chicken and sweet chilli sauce. Stir-fry for 2-3 minutes to heat through.
Serve in noodle bowls garnished with coriander and cashew nuts.