To prepare a tvfn bakers dozen recipes baked goods recipe, preheat oven to 350 degrees F. Grease and flour two 8-inch square baking pans with butter or margarine. Set aside. In medium bowl, whisk together flour, baking powder, sugar, and salt. Gradually add the wet ingredients to the dry ingredients, mixing just until combined. Pour the batter into the prepared pan(s) and bake in the preheated oven for 35 to 40 minutes or until toothpick inserted in center comes out clean. Let cool in pan for 10 minutes before removing to wire rack to cool completely.