Cheese and Potato Pie

• 1½lb potatoes
• 4 tablespoons milk
• 1egg

Cook the potatoes until they are tender, and then drain them. Mash them with the milk, egg, mustard, half the cheese, the parsley, salt and pepper. Put into a greased ovenware dish and sprinkle with the remaining cheese. Bake at 425°F, 220°C, gas mark 7 for fifteen minutes until golden-brown.