Cream the shortening and beat in the sugar. Add one yolk at a time, beating after each addition. Sift together the flour, salt and baking powder and add to batter, alternating with the milk. Beat in the vanilla.
Grease a 10-inch loaf pan and dust it lightly with flour. Pour the batter into it.
Bake in a 350 degree oven 1 hour or until a cake tester comes out clean.Cool on a cake rack. Sprinkle with confectioners' sugar.