1-3/4 c. sifted flour 1/4 c. butter
1 c. sugar 3/4 c. milk
2 tsp. baking powder 1 tsp. vanilla
1 tsp. salt 5 unbeaten egg yolks
1/4 c. soft shortening (Crisco)
Heat oven to 350 deg. Line with parchment paper a greased loaf pan 9x5x2½". Sift dry ingredients into bowl. Add shortening, butter, milk, vanilla, and egg yolks. Beat 2 minutes in mixer on medium speed, or 300 strokes by hand. Scrape sides and bottom of bowl constantly.
Bake 65 to 70 minutes (about 1-1/4 hours.)