Thoroughly stir together all-purpose flour, whole wheat flour, buttermilk powder and salt in a large mixing bowl.
With pastry blender,cut shortening into dry ingredients till mixture resembles coarse crumbs. Drizzle honey over flour mixture. Mix well. Store in covered airtight container up to six weeks at room temperature.
Before measuring,stir mix lightly. Spoon mix lightly into measuring cup, level off with flat edge knife.
For longer storage, place in a sealed freezer container and store in freezer for up to six months.
Allow mix to come to room temperature.