Sift flour once, measure, add baking powder, salt and cinnamon, and sift together three times. Cream butter thoroughly, add sugar gradually, and cream together until light and fluffy.
Add egg yolks, and beat well; then add flour, alternately with milk; a small amount at a time. Beat after each addition until smooth. Fold in egg whites. Bake in two greased 8-inch layer pans un moderate oven (375 degrees F.) 25 minutes. Spread with Morocco Frosting. Double recipe for three 9-inch layers.