Cut the chicken breasts into large chunks and season.
Heat the oil in a saucepan and quickly colour the chicken in batches. As soon as it is flecked golden, remove and set aside.
Reduce the heat and stir in the onion, garlic and chilli. Gently fry until soft then add the spices and cook for another minute.Add the diced tomato flesh and continue to fry for a minute.
Add the pak choy stems to the tomatoes and stir fry for 2 minutes. Add the chicken pieces, cream and 1/2 pint water.
Return to a simmer, season to taste and cook gently for 5 minutes then add the leaves from the pak choi. Return to a simmer and cook for 3 minutes.