Rinse white rice under a running tap in a sieve until water runs clear.
Add to the saucepan with the water and cook as per packet instructions.
Dice up capsicums, onions & chicken meat.
Melt 2 tablespoons of butter in the frying pan. Once lightly bubbling, add in capsicums and onions & saute until tender.
Add the remaining butter & melt.
Stir in plain flour and cook until bubbling.
Add in turmeric, curry powder, mustard powder, salt & pepper & combine well.
Gradually add the chicken stock, stirring until well combined to create a smooth sauce.
Stir until boiling, reduce the heat and add in chicken & canned vegetables & combine.
Cover with a lid and lower heat. Simmer until all ingredients heated through.
Rinse rice once cooked.
Serve curry over cooked rice.