My Sourdough Banana Bread is a delightful twist on a classic, blending the tangy depth of sourdough discard with the sweet, comforting flavor of ripe bananas. This recipe turns simple pantry staples into a moist, tender loaf with a golden crust and a crunchy cinnamon streusel top — perfect for slow weekend mornings or an afternoon snack with coffee.
It started as a loaf version of my original sourdough banana bread muffins, and it's become one of my favorite ways to use up discard. If you love these warm, cozy flavors, you'll want to bookmark my pumpkin banana bread muffins for fall too.
Quick Look: Sourdough Discard Banana Bread
⏱️ Ready In: about 55 minutes (10 min prep + 40–45 min bake)
🔥 Bake: 40–45 minutes at 350°F (175°C)
🍽️ Makes: 1 loaf (about 10 slices)
✨ Calories: ~366 per slice
🥄 Main Ingredients ripe bananas, sourdough discard, warm spices, cinnamon streusel
🌿 Dietary: Vegetarian · easily made dairy-free
💛 Best For: using up discard, cozy fall and winter baking, gifting
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Why You'll Love This Recipe
- It's wonderfully moist and tender. Mashed ripe bananas plus melted butter keep every slice soft, while the discard adds a subtle tang that balances the sweetness. like my chocolate chunk banana bread!
- The streusel makes it. A buttery cinnamon-sugar topping bakes into a crackly, crunchy crown — trust me and use all of it.
- It's a discard hero. This loaf turns the starter you'd toss into something genuinely crave-worthy.
- Warm spices set it apart. Cinnamon, nutmeg, and a whisper of cardamom give it bakery-level depth.
- It's endlessly adaptable. Fold in nuts or chocolate, or long-ferment it overnight. If you love cozy breakfast bakes, my banana cinnamon rolls and chocolate chunk banana muffin recipe are another reader favorite.
Jump to:
- Quick Look: Sourdough Discard Banana Bread
- Why You'll Love This Recipe
- Ingredients You'll Need
- Easy Substitutions & Variations
- How to make Sourdough Banana Bread
- Expert Tips
- What Makes This Recipe Special?
- Sourdough Banana Bread FAQs
- Troubleshooting Guide
- Storage
- Other Dessert Recipes to Consider
- Sourdough Banana Bread
Ingredients You'll Need
For the Sourdough Banana Muffins
- Ripe bananas — the riper the better. The bananas pictured above are the absolute earliest I'd use; I prefer them a bit more brown and spotty for maximum sweetness.
- Egg — binds the loaf and adds structure.
- Vanilla extract — rounds out the warm flavors.
- Brown sugar — adds moisture and a gentle molasses note.
- Sourdough discard — the tangy backbone of the recipe and a great way to use up starter.
- Melted butter — for richness and a tender crumb.
- All-purpose flour — the structure of the loaf.
- Baking powder & baking soda — the lift that keeps it light.
- Salt — sharpens all the flavors.
- Cinnamon, nutmeg & cardamom — the warm spice trio that makes this loaf taste like fall. Want something even more fall-oriented? Try my sourdough pumpkin bread or my sourdough pumpkin French toast.
For the Streusel Topping
- Flour, white sugar, melted butter & cinnamon — the four simple players in that crunchy crown. If you love a streusel-topped bake, you'll also love my sourdough discard coffee cake.
See recipe card for quantities.
Easy Substitutions & Variations
- Butter: Use a non-dairy butter like Country Crock's plant butter to make this dairy-free. A neutral oil like melted coconut oil works well here too.
- Extra crunch: Add chopped walnuts or pecans for a nutty bite.
- Chocolate: Fold in 1 cup of chocolate chips for rich, melty pockets — or go all in with my chocolate chunk banana muffins and sourdough double chocolate banana muffins.
- Fruit swap: Love a fruity muffin? My banana blackberry muffins use the same cozy base with a juicy berry twist.
- Long-ferment: Ferment the loaf overnight by making the batter and leaving out the eggs, baking powder, baking soda, and salt. Add those just before baking the next day. Some bakers only hold back the leaveners, but I like to leave out the eggs and salt too.
How to make Sourdough Banana Bread
Step 1: Preheat your oven to 350F; in a small bowl mix flour, baking powder, baking soda, salt, cinnamon, nutmeg, and cardamom.
Step 2: In a medium bowl, mash bananas thoroughly and add in melted butter, sourdough discard, vanilla extract, brown sugar, and the egg. Mix until just combined.
Step 3: Add dry ingredients to the wet ingredients and mix until fully incorporated. Be careful not to over-mix because over-mixing will impact the rise of the banana bread.
Step 4: Pour the batter into a lined loaf pan.
Step 5: Mix streusel topping ingredients and generously top the banana bread batter. Use all of it! Even if it seems like too much. Just trust me.
Step 6: Bake for 40-45 minutes or until you can stick a toothpick in it and it comes out with just a few crumbs and the top doen't jiggle when you move the pan.
Weigh your ingredients! Using a kitchen scale ensures your measurements are accurate, which is key for getting consistent results in baking. It takes the guesswork out of measuring and helps your recipes turn out exactly as intended every time.
Expert Tips
- Weigh your ingredients. A kitchen scale is the single best upgrade for consistent results — flour measured by cup can vary wildly.
- Use very ripe bananas. Brown, spotty bananas are sweeter and mash more smoothly, giving you better flavor and a moister crumb.
- Don't skimp on the streusel. Pile it all on; it sets into that signature crunchy top.
- Check early. Ovens vary, so start checking at 40 minutes. If the top browns too fast, tent loosely with foil.
- Let it cool. Slicing too soon can make the center seem gummy — patience pays off.
What Makes This Recipe Special?
What sets this loaf apart is the balance: the tang of sourdough discard against sweet bananas and warm spice, all crowned with a buttery streusel that you don't find on most banana breads. It's the kind of recipe that uses up the starter you'd otherwise toss while tasting like a proper bakery treat. If you love discard quick breads, you'll want to try my pumpkin banana bread and sourdough pumpkin bread too — both lean on the same cozy, spiced approach.
Sourdough Banana Bread FAQs
No — this recipe uses sourdough discard, the unfed starter you'd normally throw away. It adds flavor, not lift, so it doesn't need to be bubbly or recently fed.
Absolutely, though the streusel is my favorite part. The loaf bakes up beautifully on its own; just check for doneness around the same time.
The browner and spottier, the better. Very ripe bananas are sweeter and mash into the batter more smoothly.
Yes! Swap the butter (in both the loaf and the streusel) for a plant-based butter or neutral oil like melted coconut oil.
You can; see my sourdough banana bread muffins for timing, since muffins bake faster than a full loaf.
Troubleshooting Guide
| Problem | Likely Cause | The Fix |
|---|---|---|
| Loaf is dense and didn't rise | Over-mixed batter or old leaveners | Mix just until combined; check that your baking powder/soda are fresh |
| Center is gummy or underdone | Sliced too soon or underbaked | Bake until a toothpick comes out with a few crumbs; cool fully before slicing |
| Top browns before the inside is done | Oven runs hot | Tent loosely with foil for the last 10–15 minutes |
| Streusel slid off or sank | Batter too thin or topping added unevenly | Spread batter evenly and pile streusel gently across the whole surface |
| Bland flavor | Bananas not ripe enough | Use very ripe, brown-spotted bananas for the best sweetness |
Storage
For best results, store in an airtight container at room temperature for 3–5 days.
This loaf can be frozen for up to 3 months; the streusel will soften noticeably after thawing, but it will still be delicious.
Other Dessert Recipes to Consider
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Sourdough Banana Bread
Equipment
- Kitchen scale with a paddle attachment (please weigh your ingredients for best results)
- Stand Mixer (or large bowl)
- Loaf Pan (I used a 1.5 pound loaf pan)
- Parchment Paper
- Fork or other tool for mashing bananas
- Small bowl for mixing the streusel
Ingredients
Sourdough Banana Bread
- 270 g all-purpose flour 2¼ cups
- 2 teaspoon baking powder
- 1 teaspoon baking soda
- ½ teaspoon salt
- 1 teaspoon cinnamon
- ¼ teaspoon nutmeg
- ¼ teaspoon cardamom
- 345 g ripe bananas mashed (about 3-4 bananas or 1½ cups)
- 100 g sourdough discard ⅓ cup
- 85 g melted unsalted butter 6 tbsp
- 2 teaspoon vanilla extract
- 1 egg
- 147 g packed brown sugar ⅔ cup
Streusel Topping
- 60 g all-purpose flour ½ cup
- 100 g white sugar ½ cup
- 56 g melted unsalted butter 4 tbsp
- ½ teaspoon cinnamon
Instructions
- Preheat your oven to 350°F; in a small bowl, mix your dry ingredients.270 g all-purpose flour, 2 tsp baking powder, 1 tsp baking soda, ½ tsp salt, 1 tsp cinnamon, ¼ tsp nutmeg, ¼ tsp cardamom
- In a medium bowl, mash bananas thoroughly and add in the wet ingredients. Mix until just combined.345 g ripe bananas, 100 g sourdough discard, 85 g melted unsalted butter, 2 tsp vanilla extract, 1 egg, 147 g packed brown sugar
- Add dry ingredients to the wet ingredients and mix until fully incorporated. Be careful not to over-mix because over-mixing will impact the rise of the bread.
- Pour all of the batter into a loaf pan lined with parchment paper.
- Mix the streusel topping ingredients and generously top the batter. Use all of it! Even if it seems like too much. Just trust me-- it is the perfect amount!60 g all-purpose flour, 100 g white sugar, 56 g melted unsalted butter, ½ tsp cinnamon
- Bake for 40-45 mins at 350F or until you can stick a toothpick in it and it comes out with just a few crumbs. When you wiggle the pan the banana bread shouldn't jiggle. Allow to cool before serving for best results. Enjoy!
Notes
- Weigh your ingredients for the best, most consistent results — a kitchen scale makes a real difference here.
- Use very ripe bananas. The browner and spottier, the sweeter and moister your loaf will be.
- Don't over-mix the batter; over-mixing develops gluten and can make the loaf dense.
- Use all the streusel — it looks like a lot, but it bakes into the perfect crunchy top.
- Dairy-free: swap the butter in both the loaf and streusel for plant-based butter or melted coconut oil.
- Long-ferment option: make the batter leaving out the eggs, baking powder, baking soda, and salt; cover and rest overnight, then stir those in just before baking.
- Storage: keep in an airtight container at room temperature for 3–5 days, or freeze for up to 3 months (the streusel softens after thawing but is still delicious).
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