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    The Starter Jar's Best Sourdough Banana Bread: A Moist and Flavorful Recipe

    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.

    Prep15 minutes
    Cook45 minutes
    Total1h
    ServesApproximately 8-10 servings

    Ingredients

    • 1 cup (240g) ripe mashed bananas (about 3 medium)
    • 1/2 cup (120g) sourdough starter (fed or unfed/discard)
    • 1/2 cup (100g) granulated sugar
    • 1/4 cup (50g) packed light brown sugar
    • 1/4 cup (60ml) vegetable oil or melted unsalted butter
    • 1 large egg
    • 1 teaspoon vanilla extract
    • 1 1/2 cups (180g) all-purpose flour
    • 1 teaspoon baking soda
    • 1/2 teaspoon ground cinnamon
    • 1/4 teaspoon salt
    • Optional: 1/2 cup chocolate chips or chopped nuts

    Instructions

    Step 1

    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.

    Step 2

    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.

    Step 3

    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.

    Step 4

    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.

    Step 5

    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.

    Step 6

    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.

    Step 7

    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.

    Step 8

    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.

    Step 9

    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.

    Step 10

    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.