Old-Time Coconut Washboards

In a medium bowl, whisk together the flour, baking powder, baking soda and salt; set aside. In a large mixing bowl, using an electric mixer at medium speed, cream together butter, shortening and brown sugar until light and fluffy; add eggs blend well. Stir in flour mixture alternately with the buttermilk until just mixed. Fold in coconut. Cover and chill for a minimum of 2 hours. Preheat oven to 375 °F (190 °C) . Shape level tablespoons of dough into 2 1/2-inch logs. Place 2-inches apart onto ungreased baking sheets. Firmly press logs lengthwise with a fork dipped in flour to flatten. Bake for 8 to 10 minutes or until lightly browned. Transfer to wire racks to cool completely.