Country Chicken Casserole
Pre-heat the oven to 180°C, 350°F, Gas Mark 4.
Heat the oil in a large frying pan and fry chicken until browned. Transfer to an ovenproof casserole dish.
Fry the onions, mushrooms, Thyme and Garlic Granules for 2-3 minutes. Stir in the flour. Gradually blend in the stock, mustard and purée. Bring to the boil, stirring. Pour over the chicken, cover and bake for ¾ hour.
Stir in the leeks and cook for a further ¾ hour.