Pre-heat oven to 450 degrees.
Mix all dry ingredients and sift. Add shortening and cut with a pastry cutter until mixture resembles coarse meal. Add milk and stir slowly until mixture forms a ball (do not over mix).
Place ball on board sprinkled with flour. Roll out to 1/4-inch thickness and cut into 1 1/2-inch circles.
Place on an ungreased cookie sheet and bake 15 minutes.