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Vegan Sourdough Banana Bread

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Vegan Sourdough Banana Bread is a great way to use up your sourdough starter discard! This easy banana bread does not require eggs or milk, making it easy to whip up even if your pantry is a little sparse!

Overhead view of sliced loaf of vegan sourdough banana bread on a cooling rack, set on a marble countertop

Sourdough starter is really having a moment.

With everyone stuck at home, it is hard to find someone who hasn’t at least considered dabbling in sourdough.

I’ve been a fan of sourdough for a long time. For a couple of years I had a starter made using my sourdough starter tutorial.

When we got married and were gone several weeks for the wedding and honeymoon, I ended up letting my starter die off. RIP.

Several months ago I decided to get into sourdough again. This time, instead of making my own starter, I got some from a friend who works at a local bakery.

If you aren’t up for starting your own from scratch, getting some from a friend or a bakery is a great option. The older a starter is, the more flavorful it is, so you’d be ahead of the game from the jump.

Overhead view of bubbly sourdough starter in a glass jar on a marble counter

Either way, one of the things I like most about sourdough is how versatile it is.

Sure, you can make a traditional sourdough boule or batard. (My current favorite being Joshua Weissman’s No Knead Beginner Sourdough Bread.)

But you can also make less-traditional breads, such as sourdough focaccia or Roasted Strawberry Sourdough Muffins, with your starter.

Hell, you can even make pancakes, waffles, or sourdough crackers.

The thing about making recipes like muffins and crackers is that you can actually make use of your starter discard – that is, the leftover starter that you would normally throw away when you feed your starter.

But one of my favorite ways to use my discard is in this Vegan Sourdough Banana Bread.

Side view of bubbly sourdough starter in a glass jar in front of a marble backsplash


As you guys know, I’m not strictly a vegan baker, and most of the time my vegan recipes are only vegan by accident.

But the happy side-effect of this recipe being intentionally vegan is that, in addition to using up your sourdough discard, it can be made even if your pantry and fridge are looking a little sparse.

No eggs? No problem.

No milk? No problem.

No butter? No problem.

Angled view of sliced loaf of sourdough banana bread on a cooling rack with a measuring cup of flour in the backgroun

The sourdough starter provides the same moisture and tang that buttermilk would in traditional banana bread, and a “flax egg” (ground flax and water) stands in place of chicken eggs.

This recipe also has very little oil, using only 2 tablespoons of coconut oil.

If you like, you can use one large egg in place of the “flax egg” if you happen to have eggs on hand (and don’t need the bread to be vegan, of course).

Baked loaf of vegan sourdough banana bread on a cooling rack, with a bowl of brown sugar and a glass jar of sourdough starter in the background


Unlike traditional sourdough breads that require stretching and folding and long fermentation (rise) times, making Vegan Sourdough Banana Bread is not that much different from making regular banana bread.

First, combine the ground flax and the water. As that hangs out, it will thicken and take on a consistency similar to an egg. This is your “flax egg”!

Whisk together the dry ingredients.

Mix together the wet ingredients.

Add the wet ingredients to the dry ingredients and fold in some chopped pecans.

Pour into a prepared loaf pan and bake!

Overhead view of 2 gray plates with slices of sourdough banana bread next to a sliced loaf of banana bread on a cooling rack

I like to make this bread with some chopped pecans, but you could go for some chocolate chips if you prefer.

But what about toppings? Before baking, you can sprinkle the top with some more ground flaxseed, cinnamon sugar, or more chopped pecans!

You could even decorate the top with some slices of banana. Really, it’s all about what sounds best to you.

How you eat your banana bread? Well, that’s up to you. Although I personally suggest it warmed with some butter {or, you know, vegan margarine} and a hefty sprinkling of cinnamon sugar.

But that’s just my opinion.

Overhead view of baked loaf of vegan sourdough banana bread on a cooling rack next to a bowl of brown sugar, a measuring cup of flour and a jar of sourdough starter

Yield: 1 9x5-inch loaf

Vegan Sourdough Banana Bread

Overhead view of sliced loaf of vegan sourdough banana bread on a cooling rack, set on a marble countertop

Vegan Sourdough Banana Bread is a great way to use up your sourdough starter discard! This easy banana bread does not require eggs or milk, making it easy to whip up even if your pantry is a little sparse!

Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes


  • 1 cup sourdough starter
  • 3 bananas, mashed
  • 1 tablespoon ground flaxseed
  • 3 tablespoons water
  • 2 tablespoons melted coconut oil
  • 1 teaspoon vanilla
  • 1/2 cup brown sugar
  • 1/2 cup all-purpose flour
  • 1/2 cup whole wheat flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 3/4 cup chopped pecans
  • Optional toppings: Ground flaxseed; cinnamon sugar; chopped or whole pecans


  1. Preheat oven to 350 degrees. Grease a 9x5-inch loaf pan; set aside.
  2. In a small bowl, combine the ground flaxseed with the water. Set aside for 10-15 minutes, or until thickened and the consistency of an egg.
  3. In a large bowl, combine the flours, baking soda, and salt.
  4. In a medium bowl, whisk together the starter, mashed banana, flaxseed mixture (your "flax egg"), vanilla, oil, and brown sugar. Add to the dry ingredients and stir until just combined. Gently fold in the pecans.
  5. Pour the batter into the prepared loaf pan. If desired, sprinkle the top generously with extra ground flaxseed, cinnamon sugar, or pecans. Bake for 50-60 minutes, until a toothpick inserted into the center comes out clean. Allow to cool before removing from the pan, then set on a rack to cool completely.


If you don't need the recipe to be vegan, you can use 1 large egg in place of the "flax egg" (ground flax + water) in the recipe.

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Nutrition Information



Serving Size

1 slice

Amount Per Serving Calories 260Total Fat 8gSaturated Fat 2gTrans Fat 0gUnsaturated Fat 5gCholesterol 0mgSodium 197mgCarbohydrates 45gFiber 5gSugar 24gProtein 4g
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Sourdough Girl

Sunday 25th of July 2021

I love this site and picked two recipes to bake today. I made this bread and the sourdough peasant bread. The banana bread was wet inside (although the toothpick was dry - go figure) so I was wondering how many cups of mashed bananas you used. Haven't sliced the peasant bread yet. I think it's going to be amazing. Also, for the person asking about the baking soda, it interacts with the sourdough in an amazing way because the baking soda is alkaline while the starter is acidic. Ahh, science. This is really noticeable when making sourdough waffles using just starter and a couple of other things, and then adding some baking soda (dissolved in a little water) at the end. The dough rises from 3 cups to 4 cups is just a few minutes. It's always magical.

abbey boyer

Saturday 22nd of May 2021

This recipe is great! We made it into muffins (made 12) and used walnuts instead of pecans because that is what we had. After cooling, they were slightly but I think it is because I was too conservative with the gross-looking defrosted banana juice. Thank you for the great recipe, it was exactly what we wanted. :)

virginia g.

Tuesday 3rd of November 2020

Stephie, I'm interested in making vegan discarded sourdough bread with the same recipe as your banana bread recipe, please help ! I've been going nuts looking for one. thank you for your recipes I will be trying some. Sincerely Virginia


Friday 9th of October 2020

I love this bread! It looks so delicious and fun to do. Can't wait to try this recipe, thanks for sharing!


Friday 3rd of April 2020

This turned out so amazing and perfect. I used my sourdough discard and Pamela's All Purpose Gluten free flour blend in place of the All Purpose flour. I did let the batter sit for 40 min to kind of activate, and then baked it. SO. GOOD! Thanks so much for this recipe! This will be my go to banana bread recipe from now on :)


Saturday 16th of May 2020

I am so glad you enjoyed! Thank you so much for sharing!