Delia Smith’s Chicken and Mushroom Pie is made with chicken breasts, button mushrooms, onion, garlic, butter, plain flour, milk, chicken stock, freshly grated nutmeg, white pepper, salt, fresh parsley, ready-made shortcrust pastry, and a beaten egg. This delicious Chicken and Mushroom Pie recipe creates a hearty dinner that takes about 45 minutes to prepare and can serve up to 4 people.