01 -
Turn oven to 350°F and lightly coat a 9x5-inch pan with non-stick spray.
02 -
In a medium bowl, toss together flour, salt, and baking soda with a fork. Don’t overthink it.
03 -
With a hand or stand mixer, beat butter, white sugar, and brown sugar on medium-high for 1-2 minutes until smooth.
04 -
Throw in the eggs, vanilla, and bananas. Mix just enough so there’s barely any banana chunks left. Scrape the sides if needed.
05 -
Using a spatula or spoon, gently fold in the dry mix and sourdough starter. No need to overdo it.
06 -
Pour mix into your greased pan. Bake it for 55-65 minutes. Poke a toothpick in and if there’s crumbs but no goo, it’s done. Let it rest for 10 minutes before slicing.