These fudgy sourdough brownies are a satisfying way to use up your sourdough discard. They’re rich, moist, and loaded with chocolate chips.

It also makes easy and family-friendly indulgent treats that everyone will adore. Plus, you can mix them up in just one bowl without a mixer, so they’re super quick to make.

close up view of crackly topped brownies.

Fudgy Sourdough Brownies

One bowl, no mixer, and the most decadent, rich, moist brownies ever. Meet your new favorite recipe for sourdough discard.
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Serving Size 20 brownies

Equipment

  • 9 x 13 Pan
  • Mixing bowl

Ingredients 

  • 1 cup vegetable oil
  • ยฝ cup cocoa
  • 1ยฝ cups all-purpose flour
  • 2 cups granulated sugar
  • ยพ teaspoon salt
  • 3 eggs
  • ยฝ cup sourdough starter (unfed, discard)
  • 1 tablespoon vanilla extract
  • 1 cup chocolate chips

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Instructions 

  • Prep. Spray a 9 x 13 baking dish with nonstick spray. Then, preheat the oven to 350ยฐF (175ยฐC) with the rack in the center.
  • Combine all ingredients. Mix the vegetable oil, cocoa powder, all-purpose flour, granulated sugar, salt, eggs, sourdough starter, and vanilla extract in a large mixing bowl until smooth and shiny. You can use a spatula or a hand mixer. If you're using a mixer, add the chocolate chips last.
    saucepan with cocoa and melted butter.
  • Bake. Pour the batter into the prepared baking dish, then bake for 20-25 minutes. Don't forget to check for doneness at 20 minutes. The brownies are ready when you insert a toothpick in the center, and it comes out with large, moist crumbs but no wet batter. Even if they look slightly underdone, they will firm up as they cool.
    mixing bowl with chocolate chips and batter.
  • Serve. After taking the brownies out of the oven, let them cool in the pan for at least 20 minutes. Then, cut them into squares and serve them straight from the pan.
    baking dish with finished brownies.

Notes

Make sure your eggs and sourdough starter are at room temperature to help them mix better into the batter, resulting in a smoother texture.
You can use vegetable oil for extra moisture and a crackly top, but they’re still tasty with butter!
Mix the ingredients until just combined. It’s important not to overmix as it can make the brownies tough. When adding the flour, gently fold it in.
Let the brownies cool in the pan for at least 20 minutes to help them set and makes cutting them into squares easier.
Using high-quality cocoa powder and chocolate chips will enhance the flavor of your brownies significantly.
Avoid overbaking the brownies; the center should be slightly soft.
You can personalize your brownies with mix-ins like nuts, dried fruit, or different types of chocolate chips. Just add them in moderation to maintain the fudgy texture.
Calories: 277kcal | Carbohydrates: 35g | Protein: 2g | Fat: 15g | Saturated Fat: 2g | Polyunsaturated Fat: 0.2g | Monounsaturated Fat: 0.3g | Trans Fat: 0.003g | Cholesterol: 25mg | Sodium: 98mg | Potassium: 79mg | Fiber: 1g | Sugar: 25g | Vitamin A: 36IU | Calcium: 15mg | Iron: 1mg

More Tips:

If you have a kitchen scale, use it for accurate measurements to make sure consistency and prevent the brownies from being too dry or gooey.

Oven temperatures can vary, so start checking your brownies at the 18-minute mark to avoid overbaking. Look for moist crumbs on a toothpick, not wet batter.

You can bake these in a 9 x 9 pan for extra thick brownies, but they’ll need 40-45 minutes to bake.

If you’d rather use butter, substitute 1 cup of butter. Melt it in a saucepan, let it cool slightly, and then continue with the recipe.

Line your baking dish with parchment paper for easy removal and clean-up, leaving some overhang to lift the brownies out of the pan.

If you live at a high altitude, you may need to adjust the baking time or temperature. Brownies may cook faster and require a slightly lower temperature.

close up view of sourdough brownies.

Serving Suggestions

These brownies are best served with whipped cream, homemade vanilla ice cream, hot coffee, cold milk, or fresh berries.

To make these chewy sourdough brownies, you’ll need a few important tools and ingredients. Here are some that are essential for this recipe and why they’re necessary.

ingredients on white wood counter.
  • Sourdough starter (discard): This gives a tangy flavor and helps reduce waste from your sourdough baking.
  • Cocoa powder: Using high-quality cocoa powder ensures the best chocolate flavor.
  • Vanilla extract: Pure vanilla extract gives a richer flavor than imitation vanilla.
  • Parchment paper: Lining your baking dish with parchment paper makes removing the brownies easy without sticking.

Using these tools and ingredients will help you make the best brownies.

Here are some alternative ingredients you can use for this recipe.

  • Vegetable oil: You can use melted butter instead.
  • Granulated sugar: Replace it with brown sugar for a richer flavor (in the same amount).
  • All-purpose flour: A gluten-free flour blend is a good alternative.
  • Chocolate chips: Substituting them with chopped nuts or dried fruit works well, too.

These changes will alter the recipe’s outcome, but feel free to experiment with them for different variations.

Storage Instructions

You can store the brownies in an airtight container at room temperature for up to 3 days to keep them moist and delicious.

If you want to keep them longer, store the brownies in an airtight container in the refrigerator for up to 1 week. Before serving, allow them to come to room temperature for the best texture.

To freeze the brownies, wrap each one individually in plastic wrap, then place them in a freezer-safe bag or container. They can be frozen for up to 3 months.

To thaw, leave them at room temperature for a few hours or overnight in the refrigerator.

These fudgy sourdough brownies are a simple, delicious way to use up sourdough discard and satisfy your sweet tooth. With minimal prep and cleanup, theyโ€™re perfect for any occasion.

Enjoy making and sharing this easy recipe with friends and family!

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By Katie Shaw

Katie lives in Virginia with her husband, three daughters, a chocolate lab, and over thirty chickens. She loves creating simple tutorials for sourdough, bread, and soap. Her recipes, articles, and YouTube videos reach millions of people per year.

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Recipe Rating




3 Comments

  1. 4 stars
    For the chocoholic in me, this was a delicious way to use up sourdough discard! I cooked the brownies in a 9×13″ glass baking dish, and used 1/4 c. butter and 3/4 c. canola oil, and 1 3/4 c. sugar. I added dark chocolate chips. Brownies had a nice tang from the sourdough, and were very moist, not dry or cake-like. They were about 1/2″ thick. The top didn’t crack and wasn’t flaky. I would make again!