You’ve got black bananas and a jar of sourdough discard. This sourdough discard banana bread is exactly what to do with both. I tested this recipe multiple times to get the flour-to-discard ratio right, and what I ended up with is lighter, more flavorful banana bread than any version I’d made before, including a high altitude adjustment that actually works.
This recipe was originally published in 2024 and updated in June 2026 with better instructions, expanded tips, and more detail based on reader questions and feedback. Same great recipe, just more helpful.
How a Banana Graveyard Became My Best Banana Bread
Here’s the thing about starting a sourdough starter: nobody warns you about the discard situation. Suddenly you’re throwing away perfectly good starter every few days, and it feels so wrong. Meanwhile, in the Pope house, bananas are either all eaten in a day or completely ignored until they’re black. My freezer is basically a banana graveyard at this point, and I say that with love.
So naturally, I had to combine the two. I’ll be honest, I went in with low expectations. I thought the discard would be fine, just a nice little bonus. I tested this multiple times to get it right. The first batch was a little too moist because of the extra liquid the discard brings, so I kept tweaking the flour discard ratio until I had the right balance of banana flavor and a perfect, tender crumb. What I didn’t expect was for the discard to make this banana bread noticeably lighter and more flavorful than any version I’d made before. The subtle tang plays off the sweetness of the bananas in the best way. Two “throwaway” ingredients, zero regrets.
Why This Banana Bread with Sourdough Discard Stands Out
Here’s what genuinely surprised me: the discard doesn’t just add flavor, it changes the texture. The fermentation slows gluten development, which is why this bread has a lighter crumb than a standard banana bread and stays moist for several days. The subtle tang and the sweetness of the bananas are genuinely good together. I didn’t expect that going in.
If you don’t have a starter yet, that’s an easy fix. My sourdough starter recipe walks you through it with just flour and water, and once you have one going, you’ll always have discard on hand for recipes like this. When you’re ready to tackle an actual loaf, start with my Dutch Oven Sourdough Bread.
Discard Banana Bread Ingredients
- Butter: Grease the loaf pan and add it to the batter for flavor and texture. Salted or unsalted both work fine.
- Flour: I use unbleached all-purpose flour. Bleached works too. If you swap in whole-wheat flour, increase your liquid a little until the batter looks thick but still wet and sticky.
- Leavening: Both baking powder and baking soda. Use fresh, and check the dates on your cans. Old leavening is the quiet killer of quick breads.
- Salt: Just a pinch, but don’t skip it. Salt makes everything taste more like itself.
- Cinnamon: Banana and cinnamon are best friends. A little ground cinnamon adds just enough warmth without taking over.
- Mashed banana: Overripe bananas are best here. You want brown, soft, a little ugly = huge flavor! See FAQs for how to ripen fast.
- Egg: One large egg, room temperature. Cold eggs can cause the melted butter to seize, so pull it out when you pull out your bananas.
- Brown sugar: Adds sweetness and a subtle molasses flavor. Light or dark brown sugar both work, dark gives a slightly richer result.
- Sourdough discard: Active starter or unfed discard both work in this recipe. Use what you have.
- Vanilla Extract: Not used originally, but I tend to put it in everything and I never regret it!
Get the full recipe in the recipe card below.
One thing worth knowing before you make this: I grew up with sourdough. Our family had a starter that was over 50 years old, and I learned to bake with it as a kid. Those Sourdough Pancakes are still the best I’ve ever had. I’ve been baking at high altitude in Denver for over 30 years and testing recipes with a volunteer group of bakers around the country at every altitude, so when I give you adjustments, they’re based on real baking, not guesswork.
How to Make Banana Bread with Sourdough Discard
Preheat the oven to 350° F (175° C) and grease the loaf pan with butter or line it with parchment paper and set aside. I love these loaf pan liners!
I’ve provided both volume and weight measurements for this sourdough recipe. For precision, I recommend using grams. A good kitchen scale is a worthwhile investment and you’ll find it useful frequently!
No scale? No problem. I give both cups and grams in the recipe card, so you’re covered either way. If you’re measuring by volume, use the spoon and level method: fluff the flour in the bag first, then spoon it into your measuring cup until it’s heaped over the top. Level it off with the flat side of a knife. Never scoop straight from the bag. That packs the flour down and you can end up with 20 to 30% more than the recipe calls for, which is the most common reason banana bread turns out dense.
My Favorite Kitchen Scale
- This Escali Kitchen Scale is economical and accurate!
Whisk the flour, baking powder, baking soda, and cinnamon in a mixing bowl until well combined, setting it aside for later.
Add the mashed bananas, egg, brown sugar, and melted butter to a separate bowl. Then measure your sourdough discard using a kitchen scale. Whisk them together until thoroughly blended.
Then, form a well in the middle of the flour mixture and pour the wet ingredients inside, folding gently or mixing gently just until the ingredients are well combined.
Sourdough Discard Banana Bread Fresh Tips
- Do not overmix the batter; overmixing is what causes baked goods to become heavy and dense.
- Foil Tent: If the top of your loaf is browning faster than the center is baking through, loosely tent a piece of aluminum foil over the pan. Just lay it gently on top, don’t seal the edges. This lets the bread keep baking without the top burning.
- Make sure your oven heats accurately by using an oven thermometer.
Spoon the batter into the prepared loaf pan and bake it for 50-60 minutes. Once the edges pull away from the pan and the top is golden brown, the banana bread is finished baking.
Insert a skewer or toothpick into the center of the loaf. If it comes out clean, you’re done. But if you want to take all the guesswork out of it, use an instant-read thermometer. The internal temperature should read 200 to 205°F. That reading will tell you exactly where you are, no matter your oven, pan, or altitude. I use mine every time. Here’s my favorite one.
Remove the pan to a wire rack and allow to cool in the pan for one hour for the best results, then remove from the pan and cool completely on the cooling rack. Try to avoid slicing into the bread before it’s completely cooled.
High Altitude Adjustments
I bake at 5280 feet above sea level, but all of my recipes are baked by volunteer recipe testers around the country at sea level and beyond, so you can be sure the recipe will work for you.
- Increase flour by 2 tablespoons or for a total of 156 grams
- Decrease baking powder to 1 ½ teaspoons or 6 grams
- Increase to two eggs, room temperature
- Decrease sugar by 2 Tablespoons
- Bake as directed, starting to check for doneness at about 50 minutes.
If you love the idea of not wasting your extra sourdough discard, make more sourdough recipes, like these Overnight Sourdough Pancakes, which are fluffy, light, and tangy. You can use an active sourdough starter or discard. Or try these Sourdough English Muffins or Sourdough Pizza Dough.
Sourdough Banana Bread Recipe Variations
Sourdough Banana Nut Bread
Add chopped nuts, like walnuts, almonds, macadamia nuts, or pecans for a good crunch. About ½ cup is the right amount. To keep them from sinking, toss the nuts in a tablespoon of the flour mixture before folding them into the finished batter as your last step.
Chocolate Chip Banana Bread
For sweet bits of chocolate in every bite, add ½ cup of chocolate chips or mini chocolate chips. Toss the chocolate chips with one tablespoon of the flour mixture before mixing in; this will help keep the chips from sinking to the bottom of the quick bread.
Frosted Sourdough Banana Bread
Drizzle my Browned Butter Icing or this easy vanilla buttercream glaze over the top. The browned butter version is worth the extra five minutes.
Dairy-Free Sourdough Banana Bread
Dairy-free works here. Swap the butter for melted coconut oil or olive oil at a 1:1 ratio. The texture changes slightly, but it still bakes up well.
Long Ferment Option
Mix your batter as directed, then cover the bowl tightly and refrigerate overnight. When you’re ready to bake, pour into your prepared pan and bake as directed, adding 5 to 10 minutes to your bake time. The loaf won’t rise quite as high without the baking soda doing its thing, but the flavor is noticeably deeper and you get the full benefit of fermentation. Honest disclaimer: I haven’t personally tested this version yet, but it’s on my list. If you try it before I do, tell me how it goes in the comments!
Gluten-Free Sourdough Discard Banana Bread
Assuming you already have a good gluten-free sourdough starter, yes, you can adapt this recipe to be gluten-free! Replace the regular flour with your favorite cup-for-cup gluten-free all-purpose flour. I personally like a mixture of King Arthur Gluten-Free Flour plus oat flour for taste and texture. I spell out how much in the recipe card. Be sure to also check out my high-altitude banana bread recipe. It’s been thoroughly tested for gluten-free adaptations.
Banana Bread with Sourdough Discard Substitutions
- Substitute the brown sugar with white sugar, if desired.
- Sprinkle a little cinnamon mixed with turbinado sugar, or sugar in the raw, on top of the loaf before baking for a sweet, spiced crunchy topping.
- If you’re out of sourdough starter, you can still make this recipe by replacing with sour cream or Greek yogurt.
- Add more warm spices for a spicier banana bread – nutmeg and allspice are great options.
Recommended Tools
- This is my favorite loaf pan!
Sourdough Banana Bread Recipe FAQs
Grab your unpeeled bananas and lay them on a baking sheet. Bake at 250°F for 30 to 40 minutes until the skins turn dark brown and the bananas feel soft. Let them cool completely before mashing. They’ll be perfectly sweet and ready to go. Fair warning: your kitchen will smell amazing.
Yes, you can cut it by up to a third without dramatically affecting the texture. Keep in mind sugar does more than sweeten here, it adds moisture and helps with browning, so go too low, and you’ll notice a drier, paler loaf. If your bananas are very ripe and sweet, a small reduction makes sense.
Absolutely! Bake in 4 lined or buttered mini loaf pans reducing baking time to about 20-30 minutes. You can also make banana muffins or mini muffins. Bake for about 18-20 minutes.
Yes, but you need to defrost the bananas first or let them thaw at room temperature before mashing them and adding to the recipe. After thawing, drain off any excess liquid before mashing. Too much liquid throws off the balance of the flour and can make the bread gummy.
The riper the bananas, the better the banana bread! You want the outside of the banana to have lots of brown spots and a soft texture.
Sourdough discard will last indefinitely in the fridge as long as it doesn’t develop mold. It may develop a gray liquid on top called “hooch,” which may be stirred in or poured off. Stirring it in may give the dough a sourer taste.
Storage Tips for Discard Banana Bread
Room Temperature – You can keep sourdough banana bread on the counter in an airtight container, bag, or tightly wrapped in plastic wrap or aluminum foil for up to 5 days. Keep it out of direct sunlight; if your home is a little warmer, the bread will spoil more quickly. So watch and move to the refrigerator when needed.
Refrigerator – Refrigerate the bread to save leftovers for up to 7 days.
How to freeze banana bread
This quick bread freezes very well! Let it cool completely, wrap it in plastic wrap and foil, and place it in a freezer-safe bag to store for up to three months. If you store the loaf in individual slices, you can remove single servings from the freezer to thaw and enjoy without having to thaw the entire bread loaf.
What to Serve with Sourdough Discard Banana Bread
More Banana Bread Recipes
- High Altitude Banana Bread
- Banana Nutella Bread
- Banana Graham Oat Bread
- Healthy Chocolate Chip Banana Bread
- Banana Bread Bundt Cake
- Banana Chocolate Chip Cookies Recipe
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Ingredients
- 1 tablespoon Butter for greasing the pan or use loaf pan parchment liners
- 137 g unbleached all-purpose flour 1 ⅛ cups (increase 2 TBL/or 156 g total for high altitude)
- 12 g baking powder 2 teaspoons (decrease to 1 ½ teaspoon HA or 8 grams)
- 1.5 g baking soda ¼ teaspoon
- 2 g ground cinnamon 1 teaspoon
- ¼ teaspoon kosher salt
- 225 g mashed bananas about 1 ½ cups, 3-4 bananas
- 1 large egg room temperature (increase to 2 eggs for HA)
- 156 g brown sugar packed, ¾ cup (reduce by 2 TBL for High Altitude)
- 100 g sourdough discard ⅓ cup (may also use active starter)
- 22 g melted butter 1 ½ tablespoons, melted – increase to 2 TBL for high altitude
- 1 teaspoon vanilla extract optional, but I typically add it
Instructions
- Preheat the oven to 350° F (175° C). Grease a 1 pound loaf pan with butter, line with parchment paper or use loaf pan liners.1 tablespoon Butter
- In a mixing bowl, whisk together the flour, baking powder, baking soda, salt and cinnamon until well combined, and set aside.137 g unbleached all-purpose flour, 12 g baking powder, 1.5 g baking soda, 2 g ground cinnamon, ¼ teaspoon kosher salt
- In another mixing bowl, add the mashed bananas, egg, brown sugar, melted butter, vanilla extract and sourdough discard. Whisk together until thoroughly combined and blended.225 g mashed bananas, 1 large egg, 156 g brown sugar, 100 g sourdough discard, 22 g melted butter
- Make a well in the flour mixture, and pour the mixed wet ingredients into the center. Gently stir until just combined.
- Pour into the greased loaf pan, and bake for 50-60 minutes. It’s finished when the edges have pulled away from the pan, the top is golden brown, and a skewer inserted into the center comes out clean.
- Allow the bread to cool in the pan on a rack for one hour for best results, but at least 15 minutes, then carefully remove it from the pan and let it cool completely on the rack.
Notes
See the full post for variations including banana nut, chocolate chip, frosted, and substitution options. TIP: To keep nuts or chocolate chips from sinking, toss with 1 tablespoon of the flour mixture before adding to the batter. DAIRY-FREE: Swap butter for melted coconut oil at a 1:1 ratio. GLUTEN-FREE: Replace flour with a cup-for-cup gluten-free all-purpose flour. I use a blend of King Arthur Gluten-Free Flour (96g) and gf oat flour (41g) for better texture. You’ll also need a gluten-free sourdough starter. HIGH ALTITUDE: Tested at 5,280 feet and sea level.
- Increase flour by 2 tablespoons (156g total)
- Decrease baking powder to 1½ teaspoons
- Increase to 2 eggs, room temperature
- Decrease sugar by 2 tablespoons
- Start checking for doneness at 50 minutes
Nutrition
Vicky
I recently tried this and it was a delightful treat! The blend of sourdough discard and ripe bananas resulted in a moist, flavorful bread that my family adored.
So glad you loved it, thanks Vicky!
Paula
This tasted AMAZING! Will be making it this way from now on!
So glad you liked it!
Liz
This was such a good banana bread and a great way to make the most of my starter! Thanks!
YAY! Thanks, Liz!
Adri
I’m so happy I found this recipe! I always have freezer full of overripe bananas and a fridge full of sourdough discard. And this is the perfect recipe to use up both, the crumb is so moist and tender. I’ll be making it again this weekend. 😂
That’s me exactly!! Glad you liked it!
Ned
What a delicious and moist banana bread! Thank you!
Glad you liked it Ned, thank you!