Discover The Starter Jar's ultimate sourdough banana bread recipe. Achieve perfect moisture and flavor with our easy, step-by-step guide and expert tips. — Published September 1, 2026 at 6:03 AM UTC.
Preheat your oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan, or line it with parchment paper for easy removal.
In a large bowl, mash the ripe bananas thoroughly using a fork or potato masher. Ensure they are very ripe, as this enhances sweetness and moisture.
Add the sourdough starter, granulated sugar, brown sugar, oil (or melted butter), egg, and vanilla extract to the mashed bananas. Whisk these wet ingredients together until well combined.
In a separate medium bowl, whisk together the all-purpose flour, baking soda, ground cinnamon, and salt. This ensures even distribution of the leavening agents and spices.
Gradually add the dry ingredients to the wet ingredients, mixing only until just combined. Overmixing can lead to a tough banana bread, so stop as soon as no dry streaks remain.
If desired, gently fold in chocolate chips or chopped nuts at this stage. According to a 2023 survey by "Bake Magazine," 68% of home bakers prefer chocolate chips in their banana bread.
Pour the batter into the prepared loaf pan and spread evenly. You can sprinkle a little extra brown sugar on top for a caramelized crust.
Bake for 45-55 minutes, or until a wooden skewer inserted into the center comes out clean. Baking times can vary based on your oven.
Allow the banana bread to cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely. This prevents it from becoming soggy.
Slice and serve. Store any leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week.