Mix the turkey with the bread sauce and stuffing in a large saucepan and season with salt and pepper. Add the gravy and heat through thoroughly.
Spoon the turkey mixture into a pie dish or gratin dish, top with the mashed potato and sprinkle over the grated cheese.
Grill until the potato is brown and crispy. Serve with baked beans.
Tip: The pie can be made using cold ingredients if you prefer. Mix the turkey and bread sauce together and spoon into an ovenproof dish. Place the stuffing evenly between the turkey chunks, season and spoon over the gravy in an even layer. Top with the mash and grated cheese and bake in a 180°C/350°F oven for 35-40 minutes until piping hot and golden brown on top