Prep Time: 15 minutes | Cook Time: 30-35 minutes | Total Time: 50 minutes (plus cooling)
Skill Level: Easy | Intensity: Low Effort, High Reward
Yields: 16 rich, fudgy brownies
A Note from the Baker
Don’t let that tangy, bubbly discard go to waste! This recipe transforms your sourdough starter cast-off into the ultimate kitchen hero. These brownies are the perfect marriage of science and indulgence—the slight acidity of the discard tenderizes the crumb and intensifies the chocolate flavor, resulting in a brownie that’s profoundly fudgy, with a crackly top and a sophisticated depth that store-mix versions can only dream of. It’s a delicious, zero-waste triumph.
Ingredients
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1/2 cup (113g) unsalted butter, plus extra for greasing
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6 oz (170g) high-quality dark chocolate (60-70% cacao), coarsely chopped
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1 cup (200g) granulated sugar
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2 large eggs, at room temperature
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1 teaspoon pure vanilla extract
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1/2 cup (120g) unfed sourdough discard (thick or runny consistency is fine)
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1/3 cup (40g) all-purpose flour
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1/3 cup (30g) unsweetened cocoa powder, Dutch-processed preferred
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1/2 teaspoon fine sea salt
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1 cup (170g) semi-sweet chocolate chips or chunks
Equipment
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8×8-inch (20x20cm) metal baking pan
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Parchment paper
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Medium heatproof bowl (for double boiler)
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Whisk and spatula
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Cooling rack
Instructions
Step 1: Prep & Melt
Preheat your oven to 350°F (175°C). Grease your 8×8 pan and line it with parchment paper, leaving an overhang on two sides for easy removal later.
Create a double boiler: Place a heatproof bowl over a saucepan of barely simmering water (ensure the bowl doesn’t touch the water). Add the butter and chopped dark chocolate. Stir gently and constantly until completely melted, smooth, and glossy. Remove the bowl from heat and let it cool for 5 minutes.
Step 2: Combine Wet Ingredients
Whisk the granulated sugar into the warm chocolate-butter mixture until fully incorporated. It will look gritty at first but will become smoother.
Add the eggs one at a time, whisking vigorously after each addition until the mixture is thick, shiny, and pulls away from the sides of the bowl. This step is key for that shiny crust! Whisk in the vanilla extract.
Now, stir in the sourdough discard with a spatula until just combined. The batter will thicken slightly.
Step 3: Fold in Dry Ingredients
Sift the flour, cocoa powder, and salt directly into the wet ingredients. Using a folding motion with your spatula, gently mix until just a few streaks of flour remain. Be careful not to overmix.
Fold in the chocolate chips, reserving a small handful for the top if desired.
Step 4: Bake to Perfection
Pour the thick, luxurious batter into your prepared pan, smoothing it into an even layer. Sprinkle with reserved chocolate chips.
Bake for 30-35 minutes. The brownies are done when the top is set and shiny with a network of fine cracks, and a toothpick inserted into the center comes out with a few moist crumbs (not wet batter). Do not overbake—remember, they will continue to set as they cool.
Step 5: The Crucial Wait
Place the pan on a wire cooling rack and let the brownies cool completely in the pan—at least 1.5 to 2 hours. This is the hardest part, but it allows the structure to set for the perfect fudgy, not-gooey, texture.
Use the parchment overhang to lift the entire slab of brownies onto a cutting board. Slice into 16 squares with a sharp knife, wiping the blade clean between cuts for neat edges.
Storage & Serving
Storage: Store leftover brownies in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to a week. They also freeze beautifully for up to 3 months. Thaw at room temperature.
Serving Suggestion: Enjoy at room temperature for the full flavor and texture. For pure decadence, serve slightly warm with a scoop of vanilla bean ice cream and a sprinkle of flaky sea salt.
Nutrition Information
Estimated per serving (1 brownie).
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Calories: ~245 kcal
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Total Fat: 14g
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Saturated Fat: 8g
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Cholesterol: 45mg
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Sodium: 105mg
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Total Carbohydrates: 29g
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Dietary Fiber: 2g
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Sugars: 23g
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Protein: 3g