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Chocolate Chip Sourdough Blondies

Three things I love: chocolate (preferably in chip form), blondies, and sourdough. So honestly this recipe is heaven to me. Actually, let’s add a fourth thing: I love being able to use up sourdough starter discard in recipes.

It makes me really happy to see how many people are making sourdough starters during this period of quarantine. And it makes me even happier to see people looking for recipes to use up starter discard instead of just throwing it in the trash. Food waste is dumb.

If you’re looking for a new and unique recipe to use up that sourdough starter, keep reading because I have the best recipe for you.

These blondies are thick, buttery, and full of melty chocolate chips. And on top of all that, they’ve got just a hint of a sourdough taste, which adds a whole new depth of flavor.

But my favorite thing about these blondies is the texture. They’re light and fluffy, almost like a mix between a typical chewy blondie and a slice of buttery, fluffy cake. So good.

Chocolate Chip Sourdough Blondies

How to make Chocolate Chip Sourdough Blondies

These blondies are super easy to throw together and baked to perfection in under 30 minutes. The only slightly tricky part is making sure that the sourdough starter is completely incorporated, because otherwise they’ll bake unevenly and have some doughy spots throughout. Once you add the sourdough starter, be sure to mix the batter for a full 5 minutes so everything gets fully blended together.

Looking for more sourdough recipes?

Chocolate Chip Sourdough Blondies

Chocolate Chip Sourdough Blondies

Prep Time 10 mins
Cook Time 25 mins
Total Time 35 mins
Course Dessert
Servings 9


  • 6 Tbsp. vegan butter such as Earth Balance
  • 1/4 cup granulated sugar
  • 1/2 cup brown sugar
  • 1 tsp. vanilla extract
  • 1 Tbsp. white vinegar
  • 1 1/2 cups all-purpose flour
  • 1 tsp. baking soda
  • 2 tsp. cornstarch
  • 1 pinch salt
  • 1 cup sourdough starter discard
  • 1 cup semisweet chocolate chips


  • Preheat oven to 350ºF.
  • In the bowl of a stand mixer, cream together the butter and sugars until light and fluffy, about 5 minutes.
  • Add the vanilla extract and vinegar and mix an additional 2 minutes.
  • Sift together the flour, baking soda, cornstarch, and salt. Fold into the wet ingredients.
  • Add the sourdough starter and let the mixer run for 3-5 minutes until the sourdough starter is fully incorporated. Make sure the starter is FULLY incorporated or else the blondies could end up doughy in some parts.
  • Fold in the chocolate chips.
  • Pour the blondie batter into a parchment-lined 8"x8" baking pan and spread the mixture evenly. Bake for 23-25 minutes until golden brown across the whole top.


These blondies tend to sink a tiny bit right in the middle of the pan. But if they sink too much, they’re underbaked.
Chocolate Chip Sourdough Blondies

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