Sift dry ingredients. Cut in shortening until mixture resembles coarse meal. Add buttermilk to flour mixture, stirring until dry ingredients are moistened. Turn out onto a lightly floured surface; knead lightly 3 to 5 times or until smooth.
Pat dough out to 1/2-inch thickness; cut with a 2 1/4-inch biscuit cutter. Place biscuits on a lightly greased baking sheet. Bake at 450° for 10 minutes.