Do you have extra sourdough starter sitting in the fridge and not sure what to do with it? These soft, chewy sourdough chocolate brownies are a delicious way to put that discard to good use. Instead of the usual loaf of sourdough bread, try turning your starter into a fudgy, slightly tangy dessert. The starter adds a subtle tang and contributes fiber and probiotics, while the combination of melted chocolate and cocoa powder yields a rich, chocolate-forward brownie with a shiny, slightly crisp top and a chewy center.
This recipe was adapted for speed and simplicity from a reliable sourdough-baking source. It’s beginner-friendly and a great introduction to using sourdough discard beyond bread. You’ll find the directions straightforward, and the end result is a pan of brownies that freeze well, travel well, and please almost any crowd.
Why You’ll Love These Brownies
- Soft and chewy texture: These brownies are intentionally fudgy and tender, perfect for anyone who prefers a chewy bite over cakey brownies.
- Deep chocolate flavor: A blend of melted chocolate chips and cocoa powder gives these brownies an intense chocolate profile.
- Great for planning ahead: They freeze beautifully, so you can bake ahead and pull a batch out when guests arrive.
- Smart use of discard: If you often have excess sourdough starter, this is a delicious and waste-free way to use it.
Ingredients
(Printable recipe card included in the original post for convenience.)
- 1/2 cup unsalted butter
- 1 1/2 cups semi-sweet chocolate chips
- 1/2 cup cocoa powder (any kind)
- 2 teaspoons vanilla extract
- 2 large eggs
- 1 egg yolk
- 1 cup granulated sugar
- 1/2 cup brown sugar
- 125 grams sourdough starter discard (weigh for accuracy)
- 1 cup all-purpose flour
- 1 teaspoon salt
Instructions for Chocolate Sourdough Brownies
- Preheat the oven to 350°F (175°C). Line a 9-inch square baking pan with parchment paper, creating an overhang on two sides to form a sling for easy removal.
- Place the butter and chocolate chips in a microwave-safe bowl and melt together. Microwave in short intervals, stirring between each, until fully melted and glossy. Stir in the cocoa powder and vanilla until smooth, then set aside to cool slightly.
- In the bowl of a stand mixer (or using a hand mixer), beat the two eggs, extra yolk, granulated sugar, and brown sugar on medium-high speed until the mixture is pale, frothy, and smooth—usually about 7–10 minutes. This step helps build structure and contributes to the shiny crust on top.
- With the mixer on low, pour in the slightly cooled chocolate mixture and add the sourdough discard. Mix just until combined, scraping down the bowl as needed.
- Add the flour and salt all at once, then fold or mix briefly until just combined. The batter will be thick; this is expected. Spoon or drop large spoonfuls into the prepared pan and smooth into an even layer using a spatula or the back of a spoon.
- Bake at 350°F (175°C) for 35–40 minutes, until the top is slightly firm to the touch and beginning to crack. A toothpick inserted near the center should come out with a few moist crumbs—not wet batter—to ensure a fudgy interior.
Tips & Tricks
- Allow the brownies to cool completely in the pan before lifting them out on the parchment sling. Cooling helps them set and makes slicing cleaner.
- For even, square pieces, create a cardboard or cardstock template to use as a cutting guide.
- Use a large, sharp knife warmed under hot water and dried before slicing. Press the warm blade gently through the brownies and reheat between cuts for cleaner edges.
How to Store Sourdough Chocolate Brownies
Once the brownies have cooled, store them in an airtight container at room temperature or in the refrigerator for up to 4 days. To freeze, wrap tightly or place in a sealed container or zipper-top bag for up to 4 months. Thaw in the refrigerator or at room temperature before serving.
Other Brownie Ideas
- Butterscotch brownies — a sweet, caramel-like twist that’s great for summer gatherings.
- Quick classic brownies — a simple from-scratch recipe you can whip up in minutes.
- Black bean brownies — a gluten-free alternative that uses black beans for structure and moisture.
Other Sourdough Recipes to Try
- Sourdough rhubarb muffins — fruity muffins that can be adapted with other fruit.
- Honey oat sourdough sandwich bread — soft, tender slices ideal for sandwiches.
- Dutch oven sourdough bread — a step-by-step method for a crusty, rustic loaf.
- Sourdough chips or crackers — a quick, savory snack that uses discard and can be flavored with spices.
Tools Used for this Recipe
A 9×9-inch baking pan works perfectly for this recipe and bakes evenly. Parchment paper makes removing the brownies simple and clean. A stand mixer or hand mixer speeds up the process for whipping the eggs and sugars, but you can use a whisk and some elbow grease if needed.
If you tried this recipe, consider leaving a comment or sharing a photo to inspire other bakers. These brownies are forgiving, tasty, and a smart way to use sourdough discard—enjoy!