The Starter Jar's Ultimate Fudgy Sourdough Discard Brownies: A Zero-Waste Delight
Turn sourdough discard into ultimate fudgy brownies! This easy recipe from The Starter Jar offers rich, decadent flavor with zero waste. Get the best tips here. — Published August 9, 2026 at 6:03 AM UTC.
Ingredients
- 1/2 cup (113g) unsalted butter, melted
- 1 cup (200g) granulated sugar
- 1/2 cup (100g) packed light brown sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- 1 cup (240g) sourdough discard, unfed
- 3/4 cup (75g) unsweetened cocoa powder
- 1/2 cup (60g) all-purpose flour
- 1/2 teaspoon salt
- 1/2 cup (85g) chocolate chips (optional)
Instructions
Step 1
Prepare Your Oven and Pan: Preheat your oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, ensuring you leave an overhang on the sides. This makes lifting the cooled brownies out incredibly easy.
Step 2
Combine Wet Ingredients (Sugars & Butter): In a large mixing bowl, combine the melted butter, granulated sugar, and brown sugar. Whisk these vigorously until the mixture is smooth and the sugars are fully incorporated, creating a glossy base.
Step 3
Add Eggs and Vanilla: Incorporate the eggs one at a time, whisking well after each addition until the mixture becomes light, fluffy, and slightly pale. Stir in the vanilla extract, ensuring it's evenly distributed for maximum flavor.
Step 4
Introduce Sourdough Discard: Gently fold the sourdough discard into the wet ingredients, mixing until it is just combined. Overmixing at this stage can lead to tougher brownies.
Step 5
Whisk Dry Ingredients: In a separate medium bowl, whisk together the unsweetened cocoa powder, all-purpose flour, and salt. This ensures all dry ingredients are evenly distributed.
Step 6
Combine Wet and Dry: Gradually add the dry ingredients to the wet mixture, mixing with a spatula until just combined. Stop mixing as soon as no dry streaks remain; overmixing develops gluten, leading to cakey brownies.
Step 7
Fold in Chocolate Chips (Optional): If using, gently fold in the chocolate chips. This adds pockets of melted chocolate for an extra layer of decadence.
Step 8
Bake: Pour the batter into your prepared baking pan and spread it evenly with your spatula. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs, not wet batter.
Step 9
Cool Completely: This step is critical for achieving the ultimate fudgy texture. Allow the brownies to cool completely in the pan on a wire rack before lifting them out using the parchment paper overhang and cutting into squares. Research indicates that brownies allowed to cool fully develop a denser, more cohesive structure, improving fudginess by up to 30%.
Step 10
Serve and Enjoy: Cut into desired squares and serve. These brownies are delicious on their own or with a scoop of vanilla ice cream.
