Select smooth, shapely potatoes and bake until soft. Cut in halves lengthwise and scoop out a part of the pulp. Break an egg into each half, sprinkle with salt and pepper, add a teaspoonful of cream to each egg and bake in a moderate oven until the eggs are set. In the meantime, beat the white of an egg to a stiff froth, and work gradually into it the potato pulp which has been scooped out. Heap roughly over the baked eggs and keep in the oven till well puffed and brown. A little grated cheese or minced parsley may be sprinkled over the top.
The Myrtle Reed Cook Book, 1916