Heat the oil in a large pan and fry the chicken for 5-6 minutes until golden. Then add the onion and peppers and fry for 3-4 minutes until tender.
Add the red curry paste and fry for a minute, then pour over the cocount milk.
Bring to the boil then simmer for 5 minutes. Put in the cauliflower, cook for a further 5 minutes, then add the baby sweetcorn and cook for 2-3 minutes.
Cut the mangetout into strips and add them to the pan with the coriander just before serving.