Stir the sugar and butter to a cream, then add the milk and flavoring, part of the flour, the beaten whites of eggs, then the rest of the flour. Bake carefully in tins lined with buttered white paper.
When using the whites of eggs for nice cakes, the yolks need not be wasted; keep them in a cool place and scramble them. Serve on toast or with chipped beef.
The White House Cookbook (1887).