1. Stir together first 4 ingredients in a large bowl. Cut butter and shortening into flour mixture with a pastry blender until mixture resembles small peas. Mound mixture on 1 side of bowl.
2. Drizzle 1 Tbsp. apple cider along edge of mixture in bowl. Using a fork, gently toss a small amount of flour mixture into cider just until dry ingredients are moistened; move mixture to other side of bowl. Repeat procedure with remaining cider and flour mixture.
3. Gently gather dough into two flat disks. Wrap in plastic wrap, and chill 1 to 24 hours.