Prepare your bread loaf pans by lightly buttering and flouring, set aside.
Preheat oven to 350 degrees.
In a large mixing bowl, combine flour, baking powder and salt. Stir to combine.
In a blender add the walnuts and pulse a couple of times to lightly chop. Pour chopped walnuts into the flour mixture and mix to combine. (Set aside)
In the same blender, add the softened butter and sugar; pulse a couple of time to combine.
Add the egg, sliced bananas, and milk. Blend on high speed until all ingredients are incorporate into a smooth mixture.
Pour mixture over the flour and nut mixture and stir to combine.
Pour the batter into the prepared bread loaf pan, smooth top and bake in oven for 50 minutes. Using a toothpick, check to make sure bread is thoroughly cooked by inserting toothpick into the top cracks of the loaf. If there is still batter on toothpick when you pull the toothpick out, return to oven for another 8 minutes and retest. Our loaf took 70 minutes to cook on the convection setting. Depending on your oven your cooking time may differ.