Chicken supreme with truffles

Name: Chicken supreme with truffles
Ingredients: 4 chicken breasts, boneless and skin removed; 1 truffle, thinly sliced; 160g/5¾oz brie, sliced; 250g/9oz air-dried ham or pancetta, thinly sliced; fine green beans, steamed, to serve; 25ml/¾fl oz extra virgin olive oil, plus extra to grease and serve; 4 large floury potatoes, peeled and sliced thickly or cut into small cubes; 1 spicy cooking chorizo (approx. 50g/1¾oz), roughly chopped; 50g/1¾oz 'nduja, shredded; 1 large onion, thinly sliced; 2 bay leaves; 500ml/18fl oz dry white wine; 500ml/18fl oz chicken stock; salt and freshly ground black pepper; small bunch flatleaf parsley, finely chopped, to garnish