This sourdough banana bread is soft and flavorful, with a tangy twist from sourdough starter. It's the perfect way to use up overripe bananas and sourdough discard!
Preheat the oven to 350°F. Lightly grease (or line) a 9x5 inch loaf pan. In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
In a separate dish, mash the bananas until they are smooth.
In a large bowl, mix together the melted butter, brown sugar, eggs, sour cream, vanilla, sourdough starter, and mashed bananas until smooth and well-blended.
Add the dry ingredients to the banana mixture and stir just until combined—don’t overmix! If you’re adding nuts or any other mix-ins, fold them in gently.
Pour the batter into the prepared loaf pan and bake for 50–60 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for about 15 minutes. Run a knife along the edges to loosen, then carefully transfer the loaf to a wire rack. Let it cool completely before slicing.