Name: Sourdough Brownie Cookies Recipe
Prep time: 15 min
Cook time: 12 min
Total time: 3 h 27 min
Cuisine: American
Ingredients: 113g (½ cup) unsalted butter; 90g sourdough discard (unfed starter); 2 large egg yolks (reserve whites for another use); 1-2 teaspoons pure vanilla extract; 100g (½ cup) brown sugar; 100g (½ cup) fine granulated sugar; 50g (½ cup) Dutch-processed cocoa powder; 150g all-purpose flour; ½ teaspoon fine sea salt; ½ teaspoon baking soda; ¼ teaspoon baking powder; Up to 1 cup chocolate chips

Jump to Recipe· 4.3 from 13 reviews

If you have yet to experience the magic of combining tangy sourdough discard with rich chocolate, this Sourdough Brownie Cookies Recipe is about to become your new obsession. Imagine fudgy, chewy brownie interiors wrapped in a slightly crisp cookie exterior, all with a subtle depth of flavor only sourdough can bring. This recipe makes excellent use of sourdough discard to create a delightfully complex treat that feels both indulgent and wholesome. Whether you’re a seasoned baker or just looking to try something new and irresistible, these cookies deliver every time.

Ingredients You’ll Need

Inside a white pot with two handles sits a mix of ingredients before being stirred. The base layer shows a partially melted stick of light yellow butter on the right side. Overlapping the butter are piles of light brown sugar and white granulated sugar, mostly covering the bottom center and left of the pot. The rough texture of the brown sugar contrasts with the smooth, granular texture of the white sugar. The pot rests on a kitchen stove with a metallic silver surface below, all set on a white marbled textured background. The bright natural light casts soft shadows inside the pot and highlights the sugar crystals and buttery shine. photo taken with an iphone --ar 4:5 --v 7

The beauty of this Sourdough Brownie Cookies Recipe is how straightforward and accessible the ingredients are. Each one plays a crucial role: butter and sugars create that perfect caramelized sweetness, cocoa lends deep chocolate richness, and the sourdough discard provides a fantastic tang and tender texture that sets these cookies apart.

113g or ½ cup unsalted butter: Melts to create a buttery, fudgy base essential for richness and moisture.
100g or ½ cup brown sugar: Adds a chewy texture and subtle molasses flavor.
100g or ½ cup fine granulated sugar: Balances sweetness and ensures a great cookie structure.
50g or ½ cup Dutch-process cocoa powder: Provides intense chocolate flavor with a smooth finish.
2 large egg yolks: Gives richness without extra moisture from whites, making them perfect for chewy cookies.
90g sourdough discard (unfed starter): The star ingredient that offers a tangy complexity and tender crumb.
½ teaspoon fine sea salt: Enhances all the sweet and chocolate notes.
1-2 teaspoons pure vanilla extract: Adds warmth and depth to the flavor profile.
150g all-purpose flour: Provides structure while keeping cookies soft.
½ teaspoon baking soda: Helps the cookies rise gently without losing that dense, brownie-like texture.
¼ teaspoon baking powder: Supports additional lift and crumb softness.
Up to 1 cup chocolate chips (optional): Melts into gooey pockets, great for an extra hit of chocolate deliciousness.

How to Make Sourdough Brownie Cookies Recipe

Step 1: Melt and Whisk the Sugars and Butter

Begin by setting your butter, brown sugar, and granulated sugar over medium-low heat in a medium pot. As the butter melts, whisk constantly to dissolve the sugars and combine everything smoothly. Watch closely until the mixture bubbles, then allow it to boil gently for one to two minutes to develop a caramelized depth. Once done, turn off the heat and sift in the cocoa powder to avoid lumps, whisking it all together into a rich chocolate mixture.

Step 2: Add Vanilla, Salt, and Cool

Transfer the warm chocolate base to a larger bowl. Add the vanilla extract and sea salt, whisking well. You’ll notice the mixture thickening and starting to clump, which is perfectly normal. Let this cool for at least five minutes to ensure that the eggs added next won’t scramble in the heat.

Step 3: Incorporate Egg Yolks and Sourdough Discard

Once cooled sufficiently, whisk in the two egg yolks quickly and thoroughly. Then add your sourdough discard, whisking until the batter becomes shiny and smooth with no lumps. This is the magic moment where the sourdough starts to enhance the overall texture and flavor.

Step 4: Mix in Dry Ingredients

Switch to a spatula and gently fold in the all-purpose flour, baking powder, and baking soda until just combined. Avoid overmixing here to keep the cookies tender but structured enough to hold their brownie-like consistency.

Step 5: Chill with Chocolate Chips

Allow your dough to cool completely before stirring in chocolate chips; adding them while the mixture is still warm will cause them to melt into the dough rather than stay as delightful chunks. Cover the bowl tightly with plastic wrap and refrigerate for a minimum of three hours, or overnight for the best flavor and texture development.

Step 6: Bake to Perfection

Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper and lightly grease if desired. Scoop out dough balls roughly two tablespoons each onto the sheets, spacing them about one inch apart to allow for spreading. Bake for 12 minutes; the centers should look matte, not glossy, and dry on top. Let cookies cool briefly on the pan before transferring them to a wire rack to finish cooling.

How to Serve Sourdough Brownie Cookies Recipe

The image shows five round chocolate cookies placed directly on a white marbled surface. Four whole cookies lie flat, showing a smooth yet slightly cracked top texture that is dark brown with lighter brown patches. One cookie is held above the others by a woman's hand and is broken in half to reveal a thick, moist, and almost fudgy interior with melted chocolate swirls. The cookies have a dense, chewy look with a rich chocolate color throughout. The overall scene is bright with natural light casting soft shadows on the marbled surface, highlighting the cookies' texture and depth. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Delight your senses by sprinkling a small pinch of flaky sea salt atop each warm cookie just before serving. The salt brightens the chocolate flavors and balances sweetness beautifully. For a special touch, a light dusting of powdered sugar or a drizzle of melted chocolate adds elegance without much effort.

Side Dishes

These cookies pair wonderfully with a cold glass of milk or a scoop of classic vanilla ice cream for a simple yet indulgent treat. For grown-up gatherings, a rich espresso or a cup of your favorite black tea complements the sourdough’s tang while enhancing the cocoa notes perfectly.

Creative Ways to Present

Stack several cookies between squares of parchment paper in a decorative jar for gifting or parties. Another fun idea is to sandwich softened cookie halves with homemade marshmallow fluff or peanut butter cream for an exciting twist on brownies and cookies.

Make Ahead and Storage

Storing Leftovers

Store any leftover Sourdough Brownie Cookies in an airtight container at room temperature. They will stay fresh and chewy for about 3 to 4 days, making them perfect for snacking throughout the week or surprising a friend with a homemade treat.

Freezing

If you want to keep these cookies longer, freeze them in a single layer on a baking sheet first before transferring to a freezer-safe bag. They freeze beautifully for up to 3 months without losing their fudgy texture.

Reheating

When ready to enjoy, thaw frozen cookies at room temperature or warm them gently in the oven for 5 to 7 minutes at 300°F. This brings back that fresh-out-of-the-oven softness and melty chocolate pockets we love.

FAQs

Can I use sourdough starter instead of discard?

It’s best to use unfed sourdough discard in this recipe as it’s more neutral in acidity and moisture. Using active starter could alter the texture and rise, making cookies denser or change their flavor unexpectedly.

What can I do with the leftover egg whites?

Save those leftovers for making meringues, angel food cake, or even an egg-white omelet. They can also be frozen in ice cube trays for future baking projects.

Can I substitute regular cocoa powder for Dutch-process?

Yes, but your cookies may have a slightly different flavor and color. Dutch-process cocoa is less acidic and smoother, enhancing the brownie cookie’s richness more effectively.

Do I have to chill the dough overnight?

Chilling overnight deepens the flavor and improves texture, but a minimum of 3 hours is enough to see a noticeable difference in how the cookies bake and taste.

Are these cookies gluten-free?

This recipe uses all-purpose flour, so it’s not gluten-free as written. However, you can experiment with gluten-free flour blends, though results may vary in texture and spread.

Final Thoughts

There’s something truly special about the marriage of sourdough’s subtle tang and rich chocolate in this Sourdough Brownie Cookies Recipe. It’s a delicious way to breathe new life into your sourdough discard while treating yourself to warm, fudgy bites of cookie heaven. I hope this recipe finds a permanent spot in your baking rotation and brings as much joy to your kitchen as it has to mine.