Sourdough Banana Bread Muffins

If you've got overripe bananas with brown spots on the counter and a scoop of sourdough discard staring at you from the fridge, these Sourdough Banana Muffins are exactly what you need. Soft, fluffy and full of deep banana flavour, they're the kind of bake that feels both thrifty and indulgent. These Sourdough Banana Bread Muffins are a brilliant way to turn leftovers into something genuinely special.

Jump to:

• Why Add Sourdough Discard To Muffins?
• Ingredient Notes
• Variations
• Step-By-Step Method
• Recipe Tips
• Storage
• More Sourdough Discard Recipes
• Sourdough Banana Muffins

I've been making sourdough banana bread for years, and I often turn that batter into muffins. But this new recipe is different. By using oil instead of butter, these muffins are lighter, softer and noticeably more moist - less loaf-like, more bakery-style super moist muffin with a delicate crumb.

Why Add Sourdough Discard To Muffins?

Adding sourdough starter discard to muffins isn't just about using up leftovers (although that's a great way to reduce food waste). There are real baking benefits too:

• Moisture: Sourdough starter discard adds hydration and acidity to the muffin batter, resulting in soft muffins with moist crumbs.
• Tang & depth: A subtle tang balances the natural sweetness of overripe bananas and dark brown sugar.
• Fresher for longer: Thanks to the fermentation process and the acidity of sourdough, these muffins stay softer for 3-4 days in an airtight container.
• Waste reduction: It's one of my favourite ways to use extra sourdough discard without the extra cost of specialised ingredients.
• Flavour complexity: Long ferment flavours linger in the background, even though this is technically one of my easy recipes.

It's one of the quiet benefits of sourdough: even in quick bakes, you get that extra something.

Ingredient Notes

Here's everything you'll need to make these delicious muffins:

• All-purpose flour (plain flour). Gives structure without making the muffins heavy. You can replace up to 50g with whole wheat flour for a slightly nuttier flavour.
• Cinnamon & nutmeg. Just a little bit enhances the deep banana flavour without overpowering it.
• Bicarbonate of soda & baking powder. We use both. Baking soda reacts with the acidity from sourdough discard banana muffins, while baking powder ensures lift and fluffy muffins.
• Overripe bananas: The more brown spots, the better. Natural sugars intensify, giving that natural sweetness and soft texture. If you have plenty, make our Overnight Sourdough Banana Pancakes too!
• Sourdough starter discard: 100% hydration discard works perfectly. Active starter can also be used.
• Eggs: Room temperature eggs combine more evenly with the wet ingredients.
• Granulated sugar & light or dark brown sugar: Brown sugar adds moisture and caramel depth.
• Milk: Keeps the texture balanced. You can substitute with sour cream or Greek yogurt for richer muffins.
• Vegetable oil / avocado oil / canola oil: Oil makes a super moist muffin compared to butter. Unlike butter, oil remains liquid at room temperature, which keeps the crumb softer for longer. I would avoid olive oil in this recipe - it tends to overpower other flavours. 
• Chocolate chips: Optional, but highly recommended. You can also use chopped chocolate. See variations below.

Find ingredient quantities, detailed instructions and nutritional information in the recipe card at the bottom of the post. 

Variations

One of the best parts of this sourdough banana muffin recipe is how adaptable it is. Try:

• Toasted coconut: Replace chocolate chips with 60g desiccated coconut.
• Carrot & cream cheese chips: Add 50g grated carrots and 50g cream cheese chips. Or try our Sourdough Carrot Cupcakes instead!
• Nuts: 60-80g chopped walnuts, pecans or hazelnuts.
• Spiced version: Add a pinch of ground ginger or cardamom.
• Peanut butter swirl: Stir in half cup of peanut butter through the muffin batter for a nutty twist.
• Maple banana: Replace 30g sugar with maple syrup (reduce milk slightly).
• Melted coconut oil: Swap oil for melted coconut oil for subtle tropical notes.

They're brilliant for experimenting next time you bake.

Step-By-Step Method

1. Preheat the oven to 180°C and line your muffin tins with paper liners (or silicone muffin liners) or grease the muffin pan.

2. In a medium bowl, whisk together the dry ingredients: flour, spices, salt, bicarbonate of soda and baking powder.

3. In a large bowl, mash bananas thoroughly using a fork until smooth.

4. Add sourdough discard, eggs, sugars, oil and milk to the wet mixture. Whisk until combined.

5. Add dry ingredients to the wet ingredients and fold gently until just combined. A few white streaks are fine - do not overmix.

6. Stir in chocolate chips if using.

7. Divide batter evenly into muffin cups (an ice cream scoop works beautifully).

8. Bake in a preheated oven for 22-25 minutes until golden, and a skewer inserted comes out clean.

9. Cool in the muffin pan for 5 minutes, then transfer to a cooling rack.

Recipe Tips

• Don't overmix. Overworking the muffin batter develops gluten and creates dense muffins. Fold gently.
• Use both leavening agents. Baking powder gives lift; baking soda reacts with sourdough acidity for the right amount of rise.
• Watch the oven door. Avoid opening too early - sudden temperature drops affect rise.
• Weigh ingredients. A kitchen scale ensures the right amount of flour and liquid.
• Don't Let The Batter Rest Too Long. When baking soda is mixed with acidic ingredients (like buttermilk, yoghurt, or sourdough discard in this case) in a batter, it reacts instantly to produce carbon dioxide. If this batter is left to rest on the counter, the gas escapes, resulting in flatter and denser muffins.
• Fill generously. For large muffins, fill each cup about ¾ full.

The honest truth? The hardest part is waiting for them to cool.

Storage

Store sourdough banana muffins in an airtight container at room temperature for 3-4 days. They stay beautifully soft thanks to the oil and sourdough discard.

To freeze:

• Wrap individually in plastic wrap.
• Place in a freezer bag or freezer-friendly container.
• Freeze for up to 3 months.

Thaw at room temperature or warm gently in the microwave for a quick breakfast or an afternoon snack. You'll still have really moist, soft muffins even after freezing.

More Sourdough Discard Recipes

If you love using up sourdough starter discard in creative ways, you'll also enjoy my sourdough discard crackers, sourdough discard hot cross buns, and plenty more sourdough recipes linked below.