Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   5      cups          all-purpose flour -- unsifted
   2      cups          granulated sugar
   1      cup           brown sugar -- packed
   2      tablespoons   baking powder
   1      tablespoon    salt
   1      cup           shortening
     1/2  cup           butter

Preparation:

Combine flour, granulated sugar, brown sugar, baking powder, and salt in a large bowl. (You can use an electric mixer on slow speed for mixing.) Add shortening and butter; cut in with pastry blender or hands until mixture resembles coarse cornmeal. Store in an airtight container in refrigerator. NOTE: After refrigeration, measure amount of mix needed; bring to room temperature for easier blending.