Sourdough Banana Bread — Moist, Tangy, and Better Than the Original

Sourdough discard transforms banana bread. The lactic acid in the starter adds a subtle tang that balances the sweetness of overripe bananas, and it reacts with the baking soda to produce a lighter, more tender crumb than standard recipes. This is one of the easiest and most satisfying things you can make with sourdough discard — no mixer, no special equipment, and forgiving enough to make while distracted.

Ingredients

Makes one standard loaf (900g tin)

• 3 very ripe bananas (about 300g peeled weight — the riper and blacker, the better)
• 150g sourdough starter discard (unfed)
• 120g unsalted butter, melted and cooled
• 150g caster sugar (reduce to 120g if your bananas are very sweet)
• 2 large eggs
• 1 tsp vanilla extract
• 250g plain flour
• 1 tsp baking soda (bicarbonate of soda)
• ½ tsp fine salt
• ½ tsp cinnamon (optional)
• 100g chopped walnuts or dark chocolate chips (optional)

Method

1. Preheat oven to 170°C fan (190°C conventional). Grease a 900g loaf tin and line with baking paper.
2. Mash the bananas thoroughly in a large bowl. A few small lumps are fine — you want the texture to vary slightly in the final loaf.
3. Add wet ingredients: Stir in the discard, melted butter, sugar, eggs, and vanilla. Mix until combined.
4. Add dry ingredients: Sift in the flour, baking soda, salt, and cinnamon. Fold gently until just combined. Do not overmix — a few streaks of flour are fine. Fold in walnuts or chocolate chips if using.
5. Pour into tin: Transfer to the prepared tin and smooth the top. Optionally slice a banana lengthways and press it on top for decoration.
6. Bake: 55–65 minutes until a skewer inserted in the centre comes out clean (a few moist crumbs are fine, wet batter is not). If the top is browning too quickly, cover loosely with foil after 40 minutes.
7. Cool: Leave in the tin for 10 minutes, then turn out onto a wire rack. Cool for at least 20 minutes before slicing — it will be too soft and gummy straight from the oven.

Tips for the Best Sourdough Banana Bread

• Banana ripeness is everything: Use bananas that are completely black or very heavily spotted. Green or yellow bananas produce bland, starchy bread. If your bananas aren't ripe enough, place them unpeeled on a tray in a 150°C oven for 20 minutes — they'll go black and sweet.
• Don't overmix: Overmixing develops gluten and makes banana bread tough and rubbery. Stir until just combined.
• Check early: Oven temperatures vary significantly. Start checking at 50 minutes with a skewer.
• The discard doesn't need to be fresh: Discard stored in the fridge for up to 2 weeks works perfectly here. In fact, older discard with more acidity adds more complexity to the flavour.

Storage

Wrap in beeswax wrap or store in an airtight container at room temperature for up to 3 days. Banana bread actually improves on day 2 as the flavour deepens. It freezes well — slice before freezing for easy single-serving portions.

To get a sourdough starter to produce discard for recipes like this, browse our sourdough starter kits. For more discard recipes, see our full recipe collection.

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