4 chicken breasts, part boned
25 g (1 oz) 2 tbsp butter
2 tbsp olive oil
1 large onion, chopped finely
2 garlic cloves, crushed
2 (bell) peppers, red, yellow or green, cored, deseeded and cut into large pieces
225 g (8 oz) large closed cup mushrooms, sliced or quartered
175 g (6 oz) tomatoes, peeled and halved
150 ml (1/4 pint) 2/3 cup dry white wine
125 - 175 g (4 - 6 oz) green olives, pitted
4 - 6 tbsp double (heavy) cream
salt and pepper
chopped flat-leaf parsley, to garnish