Step 1

Preheat the oven to 350 degrees F. Grease the bottom and short sides of an 8 ½ by 4 ½ or a 9x5 inch loaf pan and line with a strip of parchment. Grease again, then dust with flour.

Step 2

Whisk together both of the flours, sugar, baking soda, salt, and salt. When you whisk, do it very thoroughly so that all dry ingredients are evenly distributed.

Step 3

In a large bowl, mash the bananas with a fork, then stir in the sour cream, eggs, and vanilla.

Step 4

With a heavy duty scraper, stir the dry ingredients into the banana mixture.

Step 5

Pour the melted butter and oil over the batter and stir with a heavy scraper until well blended – do not overbeat, just gently fold.

Step 6

Transfer batter to the pan and spread evenly. Sprinkle nuts over the top.

Step 7

Bake for 60 minutes or until it appears cracked on top and a toothpick inserted comes out clean

Step 8

Let cool for about half an hour, then loosen from pan. Let cool for another half hour, then remove from pan and let cool completely.