Moist Doughnuts

From 1922:

Cream together three-fourths cups sugar and three tablespoons any preferred shortening; add one teaspoon nutmeg, one cup warmed mash potatoes, and one quarter cup sweet milk. Mix all well together, stirring all the time. Now sift together two and a half cups flour, three teaspoons baking powder and one teaspoon salt and add to the first mixture, mixing well with the hands until it forms a dough stiff enough to be handled. Roll out on a floured board, about a half inch thick, cut out and fry in deep hot fat. Place on a clean cloth or paper to drain when removing from fat.