Sift the flour, baking powder, salt, and sugar. Blend with pastry blender the butter and shortening into the sifted ingredients. Make "well" in center of ingredients; stir in milk that is mixed with the egg. Mix with fork to soft dough. Knead lightly on floured board. Break into two pieces. Flatten each out to 3/4 inch thick circle. Cut into 8 wedges, repeat on other circle. Preheat oven to 450. Preheat cookie sheet in oven for 5 minutes. Bake at 450 for 10-15 minutes until lightly brown.