Sourdough Zucchini Bread Recipe
This sourdough zucchini bread turns leftover discard and garden zucchini into a moist, tender loaf with warm cinnamon spice, perfect for breakfast or an afternoon treat.
A Loaf That Turns Discard Into Dessert
If you keep a sourdough starter alive on your counter, you already know the guilt of scraping out discard and wondering what to do with it. This sourdough zucchini bread solves that problem beautifully. It is moist, gently spiced, studded with walnuts, and just sweet enough to feel like a treat while still working as a breakfast bread. It is one of those sourdough discard ideas that turns two kitchen surpluses, extra starter and a mountain of summer zucchini, into something genuinely craveable.
Unlike a true sourdough loaf, this is a quick bread. There is no long ferment, no shaping, no waiting on the rise. You mix, you pour, you bake. It is one of the easier quick sourdough breakfast recipes you will find, and it is endlessly forgiving if your zucchini harvest got a little out of hand this year.
Before we get cooking, the right tools and ingredients make a real difference here. A sturdy loaf pan helps the bread bake evenly instead of scorching at the edges, and a good box grater keeps your zucchini prep quick and mess free. These are the products that genuinely help this recipe shine:
Why This Recipe Works So Well
Zucchini bread lives or dies on moisture control, and sourdough discard actually helps here rather than complicating things. The discard adds a subtle tang that balances the sweetness, along with extra body that keeps the crumb tender for days. Combined with grated zucchini, you get a loaf that stays moist far longer than a standard quick bread.
This recipe sits comfortably alongside other sourdough summer recipes, since it is built around what is actually abundant this time of year: too much zucchini and a starter that needs regular feeding. If you are already exploring recipes using sourdough discard, this loaf is a natural next step after pancakes or crackers.
Chef's Tip: Do not skip squeezing the zucchini. Too much liquid left in the shreds can leave you with a gummy center, even after a full bake time.
Ingredient Notes
- Sourdough discard: Unfed discard straight from the fridge works perfectly. No need to bring it to room temperature first.
- Zucchini: Medium shreds on a box grater work best. Very finely grated zucchini tends to release more water.
- Two sugars: Granulated sugar keeps the crumb light while brown sugar adds moisture and a hint of caramel flavor.
- Walnuts: Optional, but they add welcome texture. Pecans or chocolate chips are easy swaps.
This loaf fits neatly into a broader rotation of sourdough healthy recipes, especially if you cut the sugar slightly or swap in whole wheat flour for part of the all-purpose flour. It is not a diet food, but it is a genuinely wholesome way to use up sourdough discard without waste.
Ready to make it? Here is the full step-by-step recipe:
Sourdough Zucchini Bread Recipe
This sourdough zucchini bread turns leftover discard and garden zucchini into a moist, tender loaf with warm cinnamon spice, perfect for breakfast or an afternoon treat.
Ingredients
- 1 3/4 cups all-purpose flour, spooned and leveled
- 1 cup sourdough discard, unfed, straight from the fridge is fine
- 1 1/2 cups zucchini, grated and lightly squeezed of excess moisture
- 3/4 cup granulated sugar
- 1/4 cup brown sugar, packed
- 1/2 cup vegetable oil, or melted coconut oil
- 2 large eggs, room temperature
- 1 tsp vanilla extract
- 1 tsp baking soda
- 1/2 tsp baking powder
- 1 1/2 tsp ground cinnamon
- 1/2 tsp salt, fine sea salt
- 1/2 cup walnuts, chopped, optional
Instruction
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x5 inch loaf pan and line it with parchment paper, leaving an overhang on the long sides.
Grate the zucchini and press it gently between paper towels or a clean kitchen towel to remove excess moisture. You do not need to squeeze it bone dry, just enough to prevent a soggy loaf.
In a large bowl, whisk together the sourdough discard, granulated sugar, brown sugar, oil, eggs, and vanilla extract until smooth and well combined.
Fold the grated zucchini into the wet mixture.
In a separate bowl, whisk together the flour, baking soda, baking powder, cinnamon, and salt.
Add the dry ingredients to the wet ingredients and fold gently with a spatula just until no streaks of flour remain. Do not overmix.
Fold in the chopped walnuts, if using, reserving a small handful to sprinkle on top.
Pour the batter into the prepared loaf pan and smooth the top. Sprinkle the reserved walnuts over the surface.
Bake for 55 to 65 minutes, until a toothpick inserted into the center comes out clean or with just a few moist crumbs. Tent the loaf loosely with foil after 35 minutes if the top is browning too quickly.
Let the bread cool in the pan for 15 minutes, then use the parchment overhang to lift it out onto a wire rack to cool completely before slicing.
Equipment
- 9x5 inch loaf pan
- Box grater
- Large mixing bowl
- Whisk
- Rubber spatula
- Wire cooling rack
Notes
Serving and Storage
Let the loaf cool completely before slicing, even though the smell coming from your oven will make that difficult. Cutting too early can cause the center to compress and turn gummy.
Once cooled, this bread keeps beautifully:
- Room temperature: Up to 2 days, tightly wrapped
- Refrigerator: Up to a week
- Freezer: Up to 3 months, sliced and individually wrapped for easy grab and go breakfasts
A warm slice with butter is hard to beat, but this bread also holds up well as a base for other sourdough recipes healthy enough for a weekday breakfast, like toasting a slice and topping it with yogurt and fresh fruit.
Variations Worth Trying
- Swap half the walnuts for chocolate chips for a dessert leaning version
- Add a streusel topping with oats, butter, and brown sugar before baking
- Fold in a handful of dried cranberries for a tart contrast
However you make it, this loaf is proof that sourdough loaves do not always need to mean a crusty round boule. Sometimes the best use of your starter is a simple, spiced, zucchini studded quick bread that disappears from the counter in a day or two.
