Instructions

1. 1
   Combine the flour, baking powder, and salt.
2. 2
   Cream the butter and sugar together until light and fluffy.
3. 3
   Whisk the eggs, and gradually beat them into the butter mixture.
4. 4
   Mix in one third of the flour mixture, followed by half the banana. Continue alternating in this way until all the dry mixture and mashed banana is incorporated.
5. 5
   Stir in the walnuts.
6. 6
   Grease and line 2 loaf pans. Divide batter evenly between pans. Sprinkle the tops with additional turbinado sugar.
7. 7
   Bake at 350°F for at least 1 hour. After this point, check the banana bread every 10 minutes or so until it is done. It will be browned, and a skewer inserted into the center of the loaf should come out clean with no more than moist crumbs attached.
8. 8
   Let cool to room temperature in the pans. Unmold.