These are made by the same rule as the bread. Fill the muffin-pans two-thirds full; let them rise till even with the top of the pans, which will take about an hour; and bake in a quick oven twenty minutes. To make them a little nicer, a large spoonful of melted butter may be added, and two beaten eggs. This will require longer to rise, as butter clogs the air-cells, and makes the working of the yeast slower. The quantities given for bread will make two dozen muffins.
The Easiest Way in Housekeeping and Cooking (1903).