This was written on a very spotted recipe card, so I would imagine it was used allot.
4 large baking potatoes
1/4 cup melted butter or oleo
Hot milk
2 slightly beaten egg yolks
Salt and pepper to taste
Scrub potatoes: rub skins with fat. Bake in hot oven 425- 45-60 min. or till done. Cut potato in half lengthwise and scoop out inside. Mash, add butter and enough hot milk to beat light. Add yolks, beat till fluffy. Season to taste. Pile lightly into shells. Rebake.