1. In a large mixing bowl, whisk together the flour, baking powder, and salt.
2. Cut in the shortening until the mixture resembles coarse crumbs.
3. Store in an airtight container in a cool, dry place for up to 6 months.
4. To use, combine 2 cups of the mix with ⅔ cup of milk. Mix until just combined, then drop by spoonfuls onto a baking sheet and bake at 450°F (230°C) for 10-12 minutes or until golden brown.