Sourdough Zucchini Muffins (That Use Your Sourdough Discard)

These sourdough zucchini muffins turn a cup of discard and a garden zucchini into a tender, tangy breakfast or snack. The crumb stays soft for days and the edges get just a little crisp right out of the oven.

They come together in one bowl, bake up reliably, and freeze like a dream. No mixer, no fuss.

Why This Recipe Earns a Spot in the Rotation

The sourdough discard does two things at once: it cuts waste and adds a faint, pleasant tang that rounds out the sugar. You won’t taste sour, just a deeper, more interesting muffin.

Grated zucchini melts into the batter, keeping everything moist without leaving behind any stringy bits or heavy oiliness. I keep a bag of these in the freezer and pull one out any morning I want something warm and homemade with zero extra work.

Ingredients

• 1 ½ cups all-purpose flour: spooned and leveled, not scooped
• 1 tsp baking soda
• ½ tsp baking powder
• ½ tsp fine sea salt
• 1 tsp ground cinnamon
• ¼ tsp ground nutmeg
• ½ cup granulated sugar: brown sugar works too, see variations
• ½ cup vegetable oil: or any neutral oil
• 2 large eggs: at room temperature if you remember
• 1 tsp vanilla extract
• 1 cup sourdough discard: unfed, straight from the fridge is fine
• 1 ½ cups grated zucchini: squeezed dry (see tips)

Variations / Substitutions

• Brown sugar for all or part of the white: adds a little more moisture and a caramel note.
• Chocolate chips or chopped walnuts: fold in ½ cup with the dry ingredients for a more substantial muffin.
• Lemon zest: add 1 teaspoon with the wet mixture to brighten the tang even more.
• Dairy-free: the recipe is already dairy-free; double-check your vanilla.

Creamy Smoked Salmon Quiche is a delicious breakfast to pair with these muffins.

How to Make Sourdough Zucchini Muffins

Step 1: Combine the Dry Ingredients

Heat the oven to 375°F (190°C) and line a 12-cup muffin tin with paper liners. In a large bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, and nutmeg until the spices are evenly dispersed.

A quick whisk now means no clumps of baking soda later, which is the fastest way to a metallic-tasting muffin.

Step 2: Whisk the Wet Mixture

In a separate bowl, whisk the oil, sugar, eggs, vanilla, and sourdough discard together until the mixture looks smooth and no streaks of egg remain, about 1 minute.

The discard will loosen the sugar quickly, so you should have a glossy, uniform liquid with just a little pull from the starter.

Step 3: Fold in the Zucchini

Add the squeezed-dry zucchini to the wet mixture and stir to distribute it evenly. Then pour the dry ingredients over the wet and fold the batter together gently, stopping as soon as no dry pockets are visible. This should take about 20 strokes, no more.

After you fold, the batter will be thick and shaggy, but any overmixing here tightens the gluten and makes the muffins tough.

Step 4: Scoop and Bake

Divide the batter evenly among the 12 lined muffin cups, filling each about three-quarters full. Bake for 18 to 22 minutes, rotating the pan halfway, until a toothpick inserted in the center of a muffin comes out with just a few moist crumbs.

Watch for the tops to dome and turn golden brown, and look for tiny cracks around the edges that tell you the crumb is set.

Step 5: Cool and Serve

Let the muffins cool in the pan on a rack for 5 minutes, then lift them out and transfer to the rack to cool completely. Serve warm or at room temperature.

Right out of the oven, the crust is slightly crisp and the inside steams for a moment when you break one open. If you can wait that long, they taste even better the next day after the tang mellows.

How to Get Tender Muffins Every Time

• Squeeze the zucchini really well.: Grate it on the large holes of a box grater, pile it into a clean kitchen towel, and wring out as much liquid as you can. The zucchini will release more water as it bakes, so you want to start with a dry shred.
• Don’t overmix the batter.: Fold just until the flour disappears, even if a few small lumps remain. Overmixing quick bread batter develops gluten and gives you dense, chewy muffins.
• Use discard that’s at room temperature if you can.: It blends in faster, but cold discard straight from the fridge works fine; just whisk a few extra seconds.
• Embrace the cracks.: A split top is normal and means your oven spring was good. It’s not a flaw.

Bake times by muffin size:

Storing Leftover Muffins

• Refrigerate: Store muffins in an airtight container at room temperature for up to 3 days, or in the fridge for up to 5 days. The refrigerator can dry them out, so room temp is better if you’ll eat them quickly.
• Reheating: A 10-second zap in the microwave or a quick pass through a toaster oven brings back that fresh-from-the-oven feel.

Frequently Asked Questions

Can I use whole wheat flour instead of all-purpose?

You can swap in up to half whole wheat flour without much change, but be warned the muffins will come out a little denser and the tang will be more pronounced.

Do I need to use brown sugar?

No, white sugar works perfectly fine. Brown sugar adds moisture and a hint of molasses, so if you have it on hand, it makes a nice upgrade.

Can I add chocolate chips or nuts?

Yes, stir in ½ cup of chocolate chips, chopped walnuts, or pecans right after you fold in the dry ingredients, just enough to spread them through the batter.

Can I freeze the batter for later?

It’s not ideal because the baking soda starts reacting as soon as it hits the acid in the discard. Bake the muffins first, then freeze them.

Sourdough Zucchini Muffins Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 20 minutes mins

Total Time 35 minutes mins

Servings: 12 servings

Calories: 180

Ingredients Method Notes

Ingredients

  

• 1 ½ cups all-purpose flour
• 1 tsp baking soda
• ½ tsp baking powder
• ½ tsp fine sea salt
• 1 tsp ground cinnamon
• ¼ tsp ground nutmeg
• ½ cup granulated sugar
• ½ cup vegetable oil
• 2 large eggs
• 1 tsp vanilla extract
• 1 cup sourdough discard
• 1 ½ cups grated zucchini

Method

 

1. Heat oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners. In a large bowl, whisk together flour, baking soda, baking powder, salt, cinnamon, and nutmeg.
2. In a separate bowl, whisk oil, sugar, eggs, vanilla, and sourdough discard until smooth, about 1 minute.
3. Stir the squeezed-dry zucchini into the wet mixture, then add the dry ingredients and fold gently until just combined, about 20 strokes.
4. Divide batter among the muffin cups and bake 18 to 22 minutes, until a toothpick inserted in the center comes out with moist crumbs.
5. Cool in the pan for 5 minutes, then transfer to a wire rack. Serve warm or at room temperature.

Notes

Squeeze the zucchini until no liquid drips out, or the muffins will sink in the center and turn gummy. If you use discard straight from the fridge, the batter may be a little thicker, which actually helps the muffins rise. The flavor deepens overnight, so they’re even better on day two.