I bake with sourdough every week, and these Sourdough Discard Zucchini Muffins are one of my favorite ways to use excess starter. They turn out soft, moist, and warmly spiced—an easy solution when the garden (or a neighbor) delivers more zucchini than you can use. I’ve tested this recipe repeatedly; it strikes the right balance of wholesome flavor and simplicity. Stir, bake, and enjoy!
One zucchini plant can produce a surprising amount, and in summer I’m always searching for new ways to use it. These muffins are a great complement to other zucchini recipes like fritters, quick breads, and casseroles. They make a satisfying breakfast or a cozy afternoon snack with coffee, and you can have them ready in under 30 minutes.
Your sourdough discard is versatile—use it for muffins, pancakes, brownies, or cinnamon rolls. If you’re new to sourdough, consider keeping discard in a jar in the fridge so it’s ready whenever a recipe calls for it.
What is Sourdough Discard?
Sourdough discard is the portion of your starter that you don’t feed when refreshing the culture. When you feed a starter, you add equal parts flour and water to some of the starter and allow it to become active. Because the starter expands, you end up with extra that you can save and bake with—this is the discard.
Feeding and maintaining a starter takes a little practice, but keeping a small jar of discard in the refrigerator makes it easy to use in quick baked goods without needing to keep the whole starter active all the time.
Ingredients You Need for Sourdough Zucchini Muffins
These muffins use simple pantry ingredients. Below are the essentials.
- Sourdough discard. Keep extra starter in a jar in the fridge until you’re ready to bake.
- Zucchini. Two small or one large zucchini, shredded to yield about 2 cups.
- Brown sugar. Adds depth and a touch of molasses flavor.
- Seasonings. Cinnamon for warmth and vanilla to round out the flavor.
- Leavening agents. Baking powder and baking soda help the muffins rise since discard alone won’t provide enough lift in a quick bake.
See the recipe card below for exact quantities and full ingredient details.
Variations & Substitutions
Change the flour: Swap some all-purpose flour for whole wheat for a nuttier flavor, or use bread flour if you prefer.
Add mix-ins: Replace walnuts with pecans or almonds, or add dried fruit, chocolate chips, or a little cocoa powder for a different twist.
Make a loaf: Pour the batter into greased loaf pans instead of muffin tins and bake 40–45 minutes, until a toothpick comes out clean.
Swap the fat: Use applesauce, mashed banana, or a neutral oil instead of melted butter for a lighter option.
How To Make Sourdough Discard Zucchini Muffins
Step 1: Preheat the oven to 400°F. Line a muffin tin with liners. Shred the zucchini and set it aside. In a medium bowl, whisk the flour, baking powder, baking soda, salt, and cinnamon together.
Step 2: In a large bowl, combine the melted butter and brown sugar until smooth.
Step 3: Add sourdough discard, milk, eggs, and vanilla to the butter-sugar mixture and stir until combined.
Step 4: Pour the dry ingredients into the wet mixture and mix until just combined. A few small lumps are fine—avoid overmixing.
Step 5: Fold the shredded zucchini and chopped walnuts into the batter about 5–8 times until evenly distributed.
Step 6: Scoop the batter into the prepared muffin tin and bake 18–20 minutes, or until a toothpick inserted in the center comes out clean. Let muffins cool briefly before transferring to a wire rack.
Tips and Tricks
- No need to peel the zucchini. The skin is thin and blends into the muffins.
- Avoid overmixing. Stir until combined; a few lumps are okay to keep the muffins tender.
- Shred finely. A finer shred yields a better texture—use a grater or food processor.
- Rotate the pan halfway through baking. This helps ensure even browning and doneness.
- Active starter works too. If you only have active starter, you can use it—the muffins will still bake up nicely since they’re a quick bake.
How to Store Sourdough Zucchini Muffins
You can prepare the batter ahead and refrigerate it, covered, for up to 48 hours before baking—this allows a gentle, longer flavor development. Once baked and cooled, store muffins in an airtight container at room temperature for up to 5 days.
For longer storage, wrap muffins individually and freeze in a sealed bag. Thaw at room temperature or warm briefly in the microwave or oven.
Best Zucchini Muffins Recipe FAQs
No—straight from the batter and oven they do not taste noticeably sour. If you refrigerate the batter for a long ferment, you may detect more tang.
Draining is optional. Leaving some moisture in the shredded zucchini helps keep the muffins tender and moist.
Yes—discard adds flavor and contributes to texture. It’s great in quick baked goods like these muffins.
More Sourdough Discard Recipes
-
Skillet Cornbread Sourdough
-
Sourdough Discard Banana Bread Recipe
-
How to Make Sourdough Discard Pancakes
-
Chocolate Chip Biscotti With Sourdough Discard
Did you love this recipe?
If you try it, please consider leaving a review and tagging the author on social media. Sharing photos and feedback helps other bakers find and enjoy the recipe.
📖 Recipe
Sourdough Zucchini Muffins Recipe
Equipment
- Mixing bowls
- Measuring cups and spoons
- Muffin tin and liners
Ingredients
- ½ cup melted butter
- 1¼ cups brown sugar
- 1 teaspoon vanilla
- 2 large eggs
- ¾ cup sourdough discard
- ½ cup whole milk
- 2 cups all-purpose flour
- 2 teaspoons cinnamon
- 2 teaspoons baking powder
- 1 teaspoon baking soda
- ½ teaspoon salt
- 2 cups shredded zucchini (no need to peel)
- ¾ cup chopped walnuts
Instructions
-
Preheat the oven to 400°F. Line a muffin tin with liners and shred the zucchini.
-
Whisk flour, baking powder, baking soda, salt, and cinnamon in a medium bowl.
-
In a large bowl, combine melted butter and brown sugar.
-
Add sourdough discard, milk, eggs, and vanilla to the butter-sugar mixture and stir until combined.
-
Fold dry ingredients into the wet mixture until just combined; a few lumps are fine.
-
Fold in shredded zucchini and walnuts until evenly distributed.
-
Scoop batter into the prepared tin and bake 18–20 minutes, until a toothpick comes out clean. Cool on a wire rack.
Notes
- No peeling needed: Zucchini skin is thin and blends well.
- Don’t overmix: Overworking batter makes muffins tough—stop when ingredients are just combined.
- Shred finely: Use a grater or food processor for best texture.
- Rotate the pan: Turn the muffin tin halfway through baking for even color and doneness.
- Active starter is fine: If you use active starter, the muffins will still bake well because they won’t rely on fermentation time like bread.
Nutrition information is an estimate and not guaranteed.