Sourdough Banana Bread (Using Active Starter or Discard)

If you’re going to make sourdough banana bread, make this one. The ratios are spot-on, the method is simple, and the result is a two tender loaves with real banana flavor and just enough sourdough character to set it apart.

This is my original sourdough banana bread recipe — the one I made up years ago when I always had overripe bananas on the counter and an active sourdough starter on standby.

It’s moist, banana‑forward, lightly sweetened with honey or maple syrup, and has just enough sourdough character to make it interesting without tasting sour. It’s sliceable, hearty, and perfect with butter and a cup of coffee.

This recipe uses active sourdough starter and includes an optional long‑fermentation method for deeper flavor, or it can be made with sourdough starter discard.

Jump to:

• Why This Recipe Works
• Equipment
• Ingredients
• Instructions
• Optional Long‑Fermented Sourdough Banana Bread
• Tips for a delicious sourdough banana bread
• Storage Tips
• Troubleshooting
• How to bake sourdough banana bread video
• Recipe
• Want to see more sourdough recipes?
• More tasty sourdough recipes!
• Comments

Why This Recipe Works

• Use active sourdough starter for structure and gentle lift
• Ripe bananas create moisture and strong banana flavor
• Honey or maple syrup adds sweetness without being overpowering
• Butter and brown sugar give richness and tenderness

Equipment

• Two 8‑inch loaf pans or one 9-inch loaf pan
• Measuring cups and spoons
• Parchment pan liners and cooking spray
• Stand mixer with paddle attachment

Ingredients

Wet Ingredients

• 4 ripe bananas, mashed
• 2 large eggs, room temperature
• ⅓ cup honey or maple syrup
• 1 cup active sourdough starter
• 1 teaspoon vanilla extract
• 8 tablespoons butter, room temperature
• ¼ cup brown sugar, tightly packed

Dry Ingredients

• 2 cups all‑purpose flour
• 1 teaspoon baking soda
• ½ teaspoon salt

Instructions

1. Preheat oven to 350°F. Line a 9×5 loaf pan with parchment paper or grease well. If using two 8‑inch pans, prepare both.
2. In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
3. In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and brown sugar on medium speed for about 2 minutes, until light and fluffy.
4. Add the eggs one at a time, beating well after each addition.
5. Add the honey (or maple syrup), vanilla extract, active sourdough starter, and mashed bananas. Mix on low speed until combined. The batter will look loose — that’s normal.
6. Add the dry ingredients to the wet ingredients. Mix on low speed just until combined. Do not over mix.
7. Pour the batter into the prepared loaf pans and smooth the tops.
8. Bake for 45–55 minutes for a 9" pan or 35-45 minutes for two 8" pans, or until a thermometer inserted into the center reads 190°F or a toothpick comes out clean.
9. Allow the bread to cool in the pan for 10–15 minutes, then remove and cool completely on a rack before slicing.

Optional Long‑Fermented Sourdough Banana Bread

This method develops deeper flavor and makes the loaf easier to digest.

Day 1

1. In a large bowl, mix together:
   • Honey or maple syrup
   • Active sourdough starter
   • Room‑temperature butter
   • Flour
2. Cover with a towel or plastic wrap and ferment at room temperature for 6 hours.
3. Transfer the bowl to the refrigerator and ferment for an additional 6–18 hours.

Day 2

1. Preheat oven to 350°F and grease or line your loaf pan.
2. Transfer the fermented mixture to a stand mixer bowl fitted with the paddle attachment.
3. Add brown sugar, eggs, vanilla, mashed bananas, salt, and baking soda.
4. Mix on low to medium speed until fully combined. The batter may appear lumpy — this is normal.
5. Pour into the prepared pan and bake as directed above.

Note: Long‑fermented sourdough banana bread is often slightly lumpy. This simply means small bits of starter didn’t fully disperse and will not affect flavor or texture.

Tips for a delicious sourdough banana bread

1. Select bananas that are very ripe. They should be less yellow and more brown and the flesh should be almost unappealing. Don't worry, this means the bread will be sweeter and have a more caramel flavor!
2. Whole wheat or fresh milled flour substitutes can be used in place of organic white flour.
3. My favorite way to prepare my loaf pan is by lining it with parchment paper. This eliminates the need for cooking spray and makes cleanup so much easier!
4. Quick breads tend to be fussy about texture. When combining the wet and dry ingredients, stir until just blended. Over-mixing can create a dense, flat loaf.

Storage Tips

• Store at room temperature, tightly wrapped, for up to 2 days
• Refrigerate for up to 1 week
• Freeze slices individually for up to 3 months

Warm slices slightly before serving and add butter — highly recommended.

Troubleshooting

1. Dense Texture: If your banana bread turns out dense, it could be due to over mixing the batter or using too much banana. Mix the batter just until the ingredients are combined and avoid over mixing to prevent a dense texture. Also, make sure to measure your mashed bananas accurately and don't add too much, as excess moisture can weigh down the bread.
2. Gummy or Undercooked Center: If the center of your banana bread is gummy or undercooked, it may not have baked long enough or the oven temperature might be too low.
3. Over browning: If the top is browning too quickly, you can tent it with foil to prevent over-browning while the center finishes baking.
4. Sunken Center: If the center of your banana bread sinks after baking, it could be due to undermixing the batter or opening the oven door too early during baking, causing the bread to collapse.
5. Uneven Baking: Uneven baking can occur if your oven temperature is not consistent or if the banana bread is placed too close to the oven walls. Use an oven thermometer to verify the accuracy of your oven temperature and place the bread on the center rack for even baking.

How to bake sourdough banana bread video

This week I stepped out of my comfort zone and created a video to go along with this recipe. It is the very first video I've ever made, and I hope you like it! I'm a very visually learner and love watching other people cook, so maybe you will to! Just typing this makes me feel sweaty, but I know you'll be understanding with my amateur editing skills (please!).

Recipe

Want to see more sourdough recipes?

If you are head over heels for sourdough, check out my recipes for sourdough starter discard crackers and sourdough focaccia. The most popular sourdough recipe on my site is Sourdough Sandwich Bread. Take a look!

Hope you have a wonderful day!

More tasty sourdough recipes!