Melt 15g butter in a non-stick frying pan and brown the chicken on both sides. Remove chicken from the pan and place in a roasting tin.
Melt the remaining butter, add the vegetables and oregano and toss until coated, seasoning with pepper.
Place in a roasting tin with the chicken.
Cook in a preheated oven at 180oC, 350oF, Gas 4 for 25-30 minutes, stirring once or twice.
Serve with baked potatoes.