Tastes Like a Fudge Brownie, Eats Like a Cookie
If you love the rich, chewy center of a fudge brownie but still want the convenience and irresistible edges of a cookie, these Sourdough Fudge Brownie Cookies are the perfect treat. They combine cocoa powder, brown sugar, butter, dark chocolate, and sourdough discard to create cookies that are deeply chocolatey, soft in the middle, and slightly crisp around the edges.
The sourdough discard adds a subtle tang that balances the sweetness while contributing to the cookies’ wonderfully chewy texture. You don’t need an active sourdough starter for this recipe, making it a great way to use leftover discard that might otherwise go to waste.
These cookies are especially delicious while still slightly warm, when the chocolate chips are soft and melty. Pair them with coffee, cold milk, or vanilla ice cream for an extra indulgent dessert.
Prep Time: 15 minutes
Chill Time: 30 minutes
Cook Time: 10–12 minutes
Total Time: About 55 minutes
Servings: 18–22 cookies
Ingredients
Dry Ingredients
1 cup (120g) all-purpose flour
â…“ cup (35g) unsweetened cocoa powder
½ tsp baking soda
½ tsp fine salt
Wet & Sweet Ingredients
½ cup (115g) unsalted butter, softened
¾ cup (150g) brown sugar
¼ cup (50g) white sugar
1 large egg
1 tsp vanilla extract
½ cup (120g) sourdough discard
2 tbsp milk
Mix-Ins
1 cup (170g) dark chocolate chips or chunks
Instructions
Prepare the Dry Ingredients
In a medium bowl, whisk together the all-purpose flour, unsweetened cocoa powder, baking soda, and salt.
Whisking thoroughly distributes the cocoa powder and baking soda throughout the flour, helping prevent pockets of baking soda or cocoa in the finished cookies.
Set the bowl aside while you prepare the wet ingredients.
Cream the Butter and Sugars
Place the softened butter, brown sugar, and white sugar in a large mixing bowl.
Using a hand mixer or stand mixer, beat the mixture for approximately 2–3 minutes, until it becomes lighter, creamy, and well combined.
The brown sugar provides moisture and chewiness, while the white sugar helps create slightly crisp edges.
Don’t worry if the mixture isn’t extremely fluffy. You want it smooth and evenly blended.
Add the Egg and Vanilla
Add the egg and vanilla extract to the butter mixture.
Beat until completely incorporated, scraping down the sides of the bowl if necessary.
The mixture should look smooth and creamy.
Mix in the Sourdough Discard
Add the sourdough discard and milk.
Mix on low speed until incorporated.
The mixture may look slightly separated or curdled at this stage. That’s perfectly fine. Once the dry ingredients are added, the dough will come together.
Use sourdough discard that is reasonably fresh and smells pleasantly tangy. Avoid discard that has developed an unpleasant or unusual odor.
Add the Dry Ingredients
Gradually add the flour and cocoa mixture to the wet ingredients.
Mix on low speed just until no obvious streaks of flour remain.
Avoid overmixing. Once the dough comes together, stop mixing.
Overworking the dough can develop too much gluten and make the cookies less tender.
Fold in the Chocolate
Add the dark chocolate chips or chunks.
Use a spatula or wooden spoon to gently fold them into the dough.
Reserve a small handful of chocolate pieces if you’d like to press extra chocolate onto the tops of the cookies before baking.
Chill the Dough
Cover the bowl and refrigerate the dough for approximately 30 minutes.
This step helps firm the butter and makes the dough easier to scoop. It also helps prevent excessive spreading in the oven.
If your kitchen is particularly warm, you can chill the dough for up to an hour.
Prepare the Oven and Baking Sheet
Preheat your oven to 350°F (175°C).
Line a baking sheet with parchment paper.
Scoop the chilled dough into portions of approximately 1½ tablespoons each and arrange them several inches apart.
The cookies will spread during baking, so avoid placing them too close together.
Bake the Cookies
Bake for approximately 10–12 minutes.
The edges should look set while the centers still appear slightly soft.
Don’t wait for the centers to look completely baked. They will continue cooking from residual heat after being removed from the oven.
For a fudgier texture, lean toward the shorter baking time.
Add the Finishing Touches
Immediately after removing the cookies from the oven, press a few reserved chocolate chips or chunks into the tops.
Allow the cookies to cool on the baking sheet for about 5 minutes.
Then transfer them carefully to a wire rack to cool completely.
The centers will become firmer as they cool while remaining soft and chewy.
Tips for the Best Brownie Cookies
Use softened butter, not melted butter. Softened butter creams properly with the sugar and helps control how much the cookies spread.
Measure the flour carefully. Too much flour can turn these brownie-style cookies cakey or dry. For the most consistent results, use a kitchen scale.
Don’t pack cocoa powder into the measuring cup. If measuring by volume, spoon the cocoa into the cup and level it off.
Use good-quality cocoa powder. Since chocolate is the dominant flavor, a good unsweetened cocoa powder makes a noticeable difference.
Don’t overmix the dough. Mix only until the dry ingredients disappear. This keeps the cookies tender and chewy.
Chill the dough. The sourdough discard adds moisture, so chilling helps the cookies maintain a thicker, fudgier shape.
Don’t overbake. This is probably the most important tip. The centers should look slightly underdone when the cookies leave the oven. Overbaking will turn the fudgy centers into a more ordinary crisp cookie.
Use chocolate chunks for dramatic chocolate pockets. Chocolate chips distribute evenly, while chopped chocolate creates larger melted pools throughout the cookies.
Allow the cookies to finish setting on the baking sheet. Moving them immediately can cause the soft centers to break apart.
For perfectly round cookies, use a round cookie cutter or large biscuit cutter to gently shape the cookies immediately after they come out of the oven.
Add flaky sea salt. A tiny sprinkle of flaky sea salt on the warm cookies creates a delicious sweet-and-salty contrast.
Variations
Double Chocolate Fudge Cookies
Add an additional ½ cup of chocolate chips to the dough for an even more intense chocolate experience.
Espresso Brownie Cookies
Add 1 teaspoon instant espresso powder to the dry ingredients. Coffee intensifies the chocolate flavor without making the cookies taste strongly of coffee.
Chocolate Peanut Butter Cookies
Fold in ½ cup peanut butter chips along with the dark chocolate. You can also drizzle the cooled cookies with melted peanut butter.
Triple Chocolate Version
Use a combination of dark chocolate chips, milk chocolate chunks, and white chocolate chips.
Mint Chocolate Cookies
Add ¼ teaspoon peppermint extract along with the vanilla. Pair with dark chocolate chunks for a refreshing chocolate-mint combination.
Orange Chocolate Cookies
Add 1 teaspoon finely grated orange zest to the wet ingredients. Orange and dark chocolate make an especially good pairing.
Walnut Brownie Cookies
Fold in ½ cup toasted chopped walnuts. Toasting the nuts first gives them a deeper flavor and better crunch.
Hazelnut Chocolate Cookies
Replace part of the chocolate chips with chopped toasted hazelnuts. A small amount of hazelnut spread can also be swirled into the dough.
Sourdough White Chocolate Raspberry Cookies
For a different flavor profile, replace the dark chocolate with white chocolate chips and fold in a small amount of freeze-dried raspberries.
Extra-Fudgy Version
For especially soft centers, chill the dough thoroughly and bake the cookies for only about 10 minutes. Allow them to cool completely on the baking sheet before moving them.
Storage & Make-Ahead Tips
Store completely cooled cookies in an airtight container at room temperature for approximately 3–4 days.
For longer storage, freeze the baked cookies in an airtight freezer-safe container. Separate layers with parchment paper and thaw at room temperature.
You can also freeze scooped cookie dough. Arrange portions on a parchment-lined tray and freeze until firm. Transfer the frozen dough portions to a freezer bag or airtight container.
Bake directly from frozen, adding a couple of minutes to the baking time as needed.
For the best texture, don’t store the cookies uncovered because they can lose their soft, chewy center.
Q&A
Do I need an active sourdough starter?
No. This recipe is specifically designed to use sourdough discard, so it doesn’t need to be bubbly or recently fed.
Can I make these without sourdough discard?
The discard contributes both moisture and acidity, so replacing it changes the recipe significantly. If you don’t have sourdough discard, it’s better to use a brownie-cookie recipe specifically developed without it.
Why are my cookies spreading too much?
The dough may be too warm, the butter may have been too soft, or the dough may not have been chilled long enough. Refrigerate the dough until firm before baking.
Why aren’t my cookies fudgy?
The most common reason is overbaking. Remove the cookies when the edges are set but the centers still look soft.
Can I use milk chocolate?
Yes. Milk chocolate creates a sweeter cookie, while dark chocolate provides a richer and slightly less sweet contrast.
Can I use salted butter?
Yes. If using salted butter, reduce the added salt slightly.
Can I skip the chilling step?
You can, but chilling is strongly recommended. It improves the texture and helps prevent excessive spreading.
Can I make smaller cookies?
Yes. Reduce the dough portions and begin checking them several minutes earlier because smaller cookies bake faster.
Why do my cookies look underbaked?
That’s intentional to a degree. Brownie-style cookies should have soft centers when removed from the oven. They continue setting as they cool.
Can I add nuts?
Absolutely. Walnuts, pecans, pistachios, or hazelnuts all work well with the chocolate base.
Nutrition
Approximate nutrition per cookie, assuming the recipe produces 20 cookies:
Calories: 175–190
Protein: 2–3g
Carbohydrates: 24–27g
Fat: 8–10g
Saturated Fat: 5–6g
Fiber: 1–2g
Sugar: 15–18g
Sodium: 90–120mg
Actual nutrition will vary depending on the chocolate brand, size of the cookies, type of sourdough discard, and exact ingredients used.
Conclusion
These Tastes Like a Fudge Brownie, Eats Like a Cookie treats are the perfect answer when you can’t decide between brownies and cookies. They have the deep cocoa flavor of a brownie, melted pockets of dark chocolate, slightly crisp edges, and a wonderfully soft, chewy center.
The sourdough discard is the unexpected ingredient that makes them particularly interesting. Its subtle tang balances the sweetness while adding moisture and complexity to the dough. Best of all, it’s a delicious way to turn leftover starter discard into something everyone will want to eat.
For the ultimate experience, serve the cookies slightly warm with a glass of cold milk or a scoop of vanilla ice cream. Add a little flaky sea salt on top, and you’ll have a rich, bakery-style chocolate cookie with an irresistible brownie-like center.