Sift dry ingredients. Cut in shortening with a pastry blender or two knives until crumbly.
Stir in milk until mixture comes together. Empty onto a lightly floured surface and knead gently 5 or 6 times just to form a ball. Pat down then roll to about 1/2 thick with a rolling pin. Cut into circles and place on a baking sheet. Bake 15 minutes at 425.