Poulet Moutarde

1. Pre-heat the oven to 400 °F (200 °C). 2. In a bowl, mix together the chicken, mustard and thyme, so the chicken is nicely coated. 3. Lay a sheet of foil over a large baking tray, then place the chicken on the foil. Lay another sheet of foil over the first, and fold over the edges tightly to make a pouch. This will need to be placed in the oven for 45-60 minutes. 4. Just before the chicken has finished cooking, you can prepare the sauce by mixing together the oil with the yogurt or fromage frais, and add a sprinkling of salt and black pepper. 5. Once the chicken has cooked, remove the foil and pour over the sauce. Serve with slices of pickles or gherkins.