These Sourdough Discard Fudgy Chocolate Brownies are a chocolate lover’s dream! They’re rich, gooey, and so easy to make, perfect for using up that extra sourdough starter.
I love how these brownies bring a little tangy flavor to the sweet chocolate goodness. They’re perfect for sharing—though I usually keep a few for myself! 😋
Making these brownies is a breeze! Just mix, bake, and enjoy. They’re great warm with ice cream or cooled for an afternoon treat! Can’t wait for you to try them!
Key Ingredients & Substitutions
Unsalted Butter: This melts beautifully and creates a rich base for your brownies. If you’re out of unsalted, salted butter works too; just skip the added salt in the recipe.
Chocolate: Semisweet or bittersweet chocolate gives these brownies a deep chocolate flavor. If you prefer a lighter taste, you can use milk chocolate, but be mindful that it may make the brownies sweeter.
Sourdough Starter Discard: This is key for adding moisture and a slight tang. If you don’t have any, you can replace it with applesauce or yogurt for a similar texture.
Flour and Cocoa Powder: All-purpose flour combined with cocoa powder is what makes the brownies fudgy. If you’re avoiding gluten, use a 1:1 gluten-free flour blend instead!
How Do I Melt Chocolate Smoothly Without Burning It?
Melted chocolate is crucial for delicious brownies, and you want it smooth, not burnt! Here’s how to do it right:
- Use the double boiler method: Place a heatproof bowl over a pot of simmering water. The steam will gently melt the chocolate.
- If using a microwave, melt in short bursts (20-30 seconds), stirring in between. This helps prevent hot spots that can burn the chocolate.
Let the melted chocolate cool slightly before mixing it into your batter. This will help ensure that it doesn’t cook the eggs when added.

Sourdough Discard Fudgy Chocolate Brownies
Ingredients You’ll Need:
- 1 cup (2 sticks) unsalted butter
- 8 ounces semisweet or bittersweet chocolate, chopped
- 1 cup granulated sugar
- 1/2 cup light brown sugar, packed
- 3 large eggs
- 1/2 cup sourdough starter discard (unfed, room temperature)
- 1 teaspoon vanilla extract
- 1/4 teaspoon salt
- 3/4 cup all-purpose flour
- 1/4 cup unsweetened cocoa powder
- Optional: flaky sea salt for sprinkling on top
How Much Time Will You Need?
This recipe takes about 15 minutes to prepare and 25-30 minutes to bake. That means you’ll have delicious fudgy brownies ready in approximately an hour! Perfect for a quick and satisfying treat!
Step-by-Step Instructions:
1. Prepare the Pan:
Start by preheating your oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper or grease it well to prevent the brownies from sticking.
2. Melt the Chocolate:
In a microwave-safe bowl or over a double boiler, melt the butter and chopped chocolate together until smooth. Stir gently to combine and let it cool slightly. This helps ensure it doesn’t cook the eggs later!
3. Combine Wet Ingredients:
In a large bowl, whisk together the granulated sugar, brown sugar, eggs, sourdough discard, and vanilla extract. Mix until everything is smooth and well combined—this is where the magic begins!
4. Mix in the Chocolate:
Slowly pour the melted chocolate and butter mixture into your wet ingredients, whisking continuously until everything is just combined. You want all that chocolate goodness integrated!
5. Sift the Dry Ingredients:
In a separate bowl, sift together the flour, cocoa powder, and salt. This helps to avoid lumps and keeps your brownies light and fluffy.
6. Combine Wet and Dry Ingredients:
Gradually add the dry ingredients to the wet mixture, folding carefully with a spatula until everything is just incorporated. Be careful not to overmix; you want your brownies to stay fudgy!
7. Prepare for Baking:
Pour the batter into the prepared pan, smoothing the top evenly with your spatula. If you want, sprinkle a pinch of flaky sea salt on top for an extra flavor boost.
8. Bake:
Bake in the preheated oven for 25-30 minutes. The edges should be set, and the center should be a little fudgy—insert a toothpick, and it should have a few moist crumbs attached.
9. Cool and Serve:
Once baked, remove the brownies from the oven and let them cool completely in the pan on a wire rack. When cool, cut into squares and serve. Enjoy the decadently fudgy brownies with a rich chocolate flavor and a delightful crackly top!
These brownies are perfect for sharing—or keeping all to yourself!
Can I Use a Different Type of Chocolate?
Absolutely! While semisweet or bittersweet chocolate gives a rich flavor, you can use milk chocolate for a sweeter taste. Just be mindful that it might alter the overall sweetness of the brownies. Dark chocolate can be used too if you prefer a more intense chocolate flavor!
Can I Substitute the Sourdough Discard?
Yes! If you don’t have sourdough discard on hand, you can substitute it with applesauce or plain yogurt in equal amounts. This will still help to create a moist texture while adding a hint of tang.
How Should I Store Leftover Brownies?
Store any leftover brownies in an airtight container at room temperature for up to 3 days. If you want them to last longer, you can refrigerate them for about a week. To enjoy them warm, simply reheat in the microwave for a few seconds!
Can I Add Nuts or Other Mix-Ins?
Definitely! Feel free to add chopped nuts, chocolate chips, or even dried fruits to the batter for a fun twist. Just remember to fold them in gently after mixing the main batter to keep the brownies fudgy.



