1. Whisk together first 3 ingredients in a large bowl. Cut in shortening with a pastry blender until mixture resembles small peas and dough is crumbly; stir in cheese. Add buttermilk, stirring just until dry ingredients are moistened.
2. Turn dough out onto a lightly floured surface; knead 3 to 4 times. Place dough in a bowl; cover and chill 1 hour.
3. Preheat oven to 350°. Turn dough out onto a lightly floured surface. Pat or roll dough to 1-inch thickness; cut with a 1 1/2-inch round cutter, and place on parchment paper-lined baking sheets.
4. Bake at 350° for 20 to 22 minutes or until golden brown.
Unbaked biscuits may be frozen up to 1 month. Bake frozen biscuits as directed for 26 to 28 minutes or until golden brown.