Prep Time: 15 minutes
Cook Time: 35-40 minutes
Total Time: 55 minutes (plus cooling)
Skill Level: Beginner
Intensity: Low effort, high reward
Yield: 16 rich, fudgy brownies
Lasts: 5 days at room temperature, 3 months frozen
Introduction
Turn your sourdough discard into something spectacular with these decadent, fudgy brownies. This recipe transforms what might have been wasted into the star ingredient of the ultimate chocolate treat. The slight tang from the discard perfectly balances the deep chocolate flavor, while contributing to a uniquely tender crumb. These brownies feature that coveted shiny, crackly top and a rich, moist interior that chocolate lovers dream about. Whether you’re an avid sourdough baker looking to reduce waste or simply seeking the best brownie recipe you’ll ever make, this is your new go-to.
Ingredients
Dry Ingredients
1 cup (120g) all-purpose flour
½ cup (45g) unsweetened cocoa powder, Dutch-process preferred
½ teaspoon baking powder
½ teaspoon fine sea salt
1½ cups (300g) granulated sugar
Wet Ingredients
½ cup (113g) unsalted butter
8 ounces (225g) semi-sweet chocolate, chopped (or chocolate chips)
½ cup (120g) active or discard sourdough starter (100% hydration)
2 large eggs, room temperature
2 teaspoons pure vanilla extract
Optional Additions
½ cup (85g) chocolate chips or chunks
½ cup (60g) chopped walnuts or pecans
Flaky sea salt for finishing
Equipment Needed
8×8-inch square baking pan
Parchment paper
Medium and large mixing bowls
Whisk and spatula
Double boiler or microwave-safe bowl
Cooling rack
Step-by-Step Instructions
Step 1: Preparation (5 minutes)
Preheat your oven to 350°F (175°C).
Line an 8×8-inch baking pan with parchment paper, leaving overhang on two opposite sides for easy removal.
In a medium bowl, whisk together flour, cocoa powder, baking powder, and salt until thoroughly combined and no lumps remain.
Step 2: Melt Chocolate and Butter (5 minutes)
Create a double boiler by placing a heatproof bowl over a saucepan with 1-2 inches of simmering water (ensure the bowl doesn’t touch the water).
Add butter and chopped chocolate to the bowl, stirring occasionally until completely melted and smooth.
Remove from heat and let cool for 5 minutes (important to prevent cooking the eggs).
Step 3: Combine Wet Ingredients (3 minutes)
In a large mixing bowl, whisk together the slightly cooled chocolate mixture and sugar until well combined.
Add eggs one at a time, whisking vigorously after each addition until fully incorporated.
Whisk in vanilla extract and sourdough discard until the mixture is smooth and glossy.
Step 4: Incorporate Dry Ingredients (2 minutes)
Add the dry ingredients to the wet mixture in three additions, folding gently with a spatula until just combined after each addition. Do not overmix.
If using, fold in chocolate chips or nuts until evenly distributed.
Step 5: Bake to Perfection (35-40 minutes)
Pour the thick batter into your prepared pan, spreading evenly to the corners.
Bake on the center rack for 35-40 minutes, rotating pan halfway through.
The brownies are done when a toothpick inserted 1-inch from the edge comes out with moist crumbs (not wet batter). The center should be set but still slightly soft.
For extra fudgy brownies, err on the side of underbaking.
Step 6: Cool and Serve (2 hours minimum)
Place the pan on a cooling rack and let brownies cool completely in the pan (about 2 hours).
For clean cuts, refrigerate cooled brownies for 30 minutes before slicing.
Using the parchment overhang, lift the brownie slab from the pan onto a cutting board.
Cut into 16 squares with a sharp knife, wiping blade between cuts.
Sprinkle with flaky sea salt if desired before serving.
Baker’s Notes
Sourdough Discard Tips
Your discard can be straight from the refrigerator; no need to feed or activate it
Discard that’s 1-2 weeks old works perfectly
The acidity tenderizes the gluten, creating a superior texture
If you don’t have discard, substitute with ¼ cup Greek yogurt mixed with ¼ cup water
Texture Customization
For fudgier brownies: Bake 33-35 minutes
For cake-like brownies: Bake 38-40 minutes and add ¼ teaspoon baking soda
For extra crackly top: Ensure eggs are room temperature and whisk vigorously when adding to chocolate mixture
Storage & Shelf Life
Room Temperature: Store in an airtight container for up to 5 days
Refrigerator: Up to 2 weeks (bring to room temperature before serving)
Freezer: Individually wrap brownies and freeze for up to 3 months
Pro Tip: Brownies taste best on day 2 as flavors fully develop
Nutrition Information
Per serving (1 brownie, based on 16 servings)
Calories: 280
Total Fat: 14g (18% DV)
Saturated Fat: 8g (40% DV)
Cholesterol: 45mg (15% DV)
Sodium: 95mg (4% DV)
Total Carbohydrates: 37g (13% DV)
Dietary Fiber: 2g (7% DV)
Sugars: 27g
Protein: 4g
Vitamin D: 0.2mcg (1% DV)
Calcium: 25mg (2% DV)
Iron: 2mg (10% DV)
Potassium: 135mg (2% DV)