In a non stick wok add 2 tablespoon of oil and toss in sliced green or red chilli, add sliced onions, garlic, ginger and green chilli paste. Saute for a minute, then add the bell peppers cook for another minute. Add half of the Chopped spring onions.
In a bowl add 2 tablespoon corn flour and add half a cup of water and make a slurry.