 | Sift flour, baking powder and salt together |
 | Cream shortening and sugar and beat in egg yolks |
 | Add vanilla and milk alternately with dry ingredients |
 | Fold in beaten egg whites and then blueberries |
 | Bake in greased 8 or 9 inch square pan at 350 degrees for 35-45 minutes. |
 | Sprinkle with powdered sugar after cooling. |