Preheat oven to 375 degrees F (165 degrees C). Grease and flour one 9x5 inch loaf.
Blend together bananas and sugar. Next, add 1 egg and slowly pour in the cooled butter.
Sift dry ingredients together and add to banana mixture and stir in walnuts. Blend.
Pour into the loaf pan and bake in the oven. Begin checking the banana bread after 45 minutes. Loaves are done when your inserted knife comes out clean.