In a large bowl, stir together the flour, baking powder, salt, brown sugar and oats. Blend in the shortening so that it is fully absorbed. Store this mixture in an airtight container at room temperature for up to 8 weeks in a cool dry place. Prepare biscuits from the mix using the following recipe.
Use: 2 cups of cookie mix, 1 egg, beaten, 1 teaspoon vanilla and 1 cup of chocolate chips, coconut, raisins or nuts. Preheat the oven to 190 degrees C. Grease baking tray. In a large bowl, stir together the cookie mix, egg, vanilla and the additions of your choice. Drop by rounded spoonfuls onto the prepared baking tray. Flatten slightly with a fork. Bake for 8 to 10 minutes in the preheated oven. Cool on wire racks. Makes about 2 dozen.