Sourdough Chocolate Cake: A Decadent Way to Use Your Active Starter or Discard
Embarking on new culinary adventures in the kitchen has always been a passion of mine, and recently, my focus has shifted to the fascinating world of sourdough baking. While a classic chocolate cake is a beloved staple, venturing into the realm of Sourdough Chocolate Cake has truly expanded my baking horizons. The journey of nurturing a sourdough starter is a commitment, a daily ritual of feeding and tending. It’s a labor of love, and admittedly, it can sometimes feel like a chore!
However, the sheer joy my family gets from a beautifully crafted sourdough loaf, coupled with the immense satisfaction I experience when slicing into a perfectly baked creation, makes every effort worthwhile. If not for these moments of pure culinary bliss, I might simply opt for buying sourdough from one of the many excellent bakeries nearby. But no, the call of the starter is strong, and I continue to care for it diligently. This exceptional sourdough chocolate cake recipe offers a delightful and incredibly rewarding reason to keep that starter thriving and put it to good use.

The Delightful 8-Inch Square Sourdough Chocolate Cake
This remarkable chocolate cake recipe draws its inspiration from a trusted source: King Arthur Baking Company, a name synonymous with quality baking. Their original sourdough bread recipe is already a favorite of mine, and their expertise shines through in this dessert. While King Arthur offers a 9×13 inch chocolate sourdough cake, often paired with a coffee frosting, my adaptation caters to a slightly smaller, more manageable 8-inch square pan. This version is designed to be served directly from the dish, and it’s generously frosted with a consistently reliable and utterly delicious cocoa powder icing. This makes it perfect for smaller gatherings or when you crave a decadent treat without baking a massive batch.
The beauty of this particular recipe lies in its balanced presentation and convenience. The 8-inch square size is ideal for fitting into most standard baking pans and ensures that each slice is deep and substantial, offering a satisfying experience. My choice of a rich cocoa powder icing complements the unique flavor profile of the sourdough cake without overpowering it. It’s a classic pairing that highlights the best of both worlds: the deep, comforting notes of chocolate and the subtle, intriguing tang from the sourdough. The simplicity of preparation and serving makes this an excellent choice for bakers of all skill levels, especially those looking to explore baking with sourdough.

Unraveling the Unique Sourdough Chocolate Flavor
What truly sets this Sourdough Chocolate Cake apart is its incredible depth and a subtly complex flavor that develops during baking. This is a wonderfully deep and tall cake, boasting a texture that yields just enough with each bite – moist, tender, and incredibly satisfying. The sourdough component doesn’t necessarily make it taste like bread; rather, it introduces an elusive, slightly tangy undertone that elevates the richness of the chocolate. Describing this flavor is challenging because it’s not overt, but it’s distinctly there – a faint, pleasant sourness that brightens the chocolate notes and adds an unparalleled dimension. It prevents the cake from being overly sweet, creating a harmonious balance that will leave you craving more.
In fact, one reviewer of the original King Arthur recipe mentioned it being too sweet. However, I found this particular version to be perfectly balanced, with the sourdough element skillfully counteracting any potential sweetness overload. This nuanced flavor is a testament to the magic of sourdough: it doesn’t just leaven; it enriches and transforms. The slight tang acts as a sophisticated counterpoint to the deep cocoa, creating a flavor profile far more interesting and refined than a standard chocolate cake. It’s an experience that truly must be tasted to be understood, captivating your palate with every forkful.
Why This Sourdough Chocolate Cake is a Must-Try
I apologize for my enthusiastic rambling, but truly, you must try this cake! I won’t go as far as to say it’s so revolutionary that you should rush out and start a sourdough starter immediately, but if you already maintain a starter and are looking for a fantastic way to utilize it, this is an incredibly rewarding recipe. It’s an excellent solution for using up excess sourdough starter discard, transforming what might otherwise be thrown away into a truly delicious dessert.
I believe this is definitely a “make-again” cake, a recipe that will earn a permanent spot in your baking rotation. Its unique flavor and satisfying texture make it a standout among chocolate cakes. I’ll be sure to update you if anyone declares it an “amazing” or “life-changing” cake, or if I manage to conjure up even better descriptors for its subtle yet impactful flavor. For now, trust me when I say it’s a wonderfully efficient and delicious method for incorporating your sourdough discard into a luxurious treat.
Sourdough Starter Management: An Important Update
Speaking of sourdough starters, I have discovered a new favorite recipe for maintaining mine. It’s the one featured on Serious Eats, and it’s a game-changer for its simplicity and efficiency. What makes it so brilliant is that it requires feeding only about an ounce of flour and water daily. This significantly reduces waste and makes the routine of keeping a healthy, active starter much less demanding. For anyone struggling with the time or ingredient commitment of sourdough starter maintenance, this Serious Eats method provides a practical and sustainable approach, ensuring you always have a vibrant starter ready for baking delicious recipes like this chocolate cake.
Maintaining a sourdough starter doesn’t have to be an arduous task. The Serious Eats method simplifies the process, making it more accessible for busy bakers. A healthy starter, whether active or discard, is the heart of many incredible recipes, including this decadent chocolate cake. By opting for a low-maintenance feeding schedule, you can enjoy the benefits of sourdough baking—its unique flavors, improved digestibility, and the satisfaction of creating something truly artisanal—without the stress. This approach ensures that your starter remains a joy, not a burden, always ready to lend its magic to your next baking project.
More Sourdough Inspirations
If you’re looking for other exciting ways to incorporate your sourdough starter or discard into your baking, explore these fantastic recipes:
- Sourdough Honey Whole Wheat Bread
- Sourdough Lemon Poppy Seed Biscotti
- Small Batch Sourdough English Muffins
- Sourdough Discard Biscotti — Cheddar and Jalapeno
- Sourdough Discard Scones
Mastering Sourdough Chocolate Cake: Tips and Tricks
Creating a truly magnificent sourdough chocolate cake involves more than just following the steps; it’s about understanding the nuances of baking with a live culture. Here are some additional tips to ensure your cake turns out perfectly every time:
- Starter Activity: While this recipe works well with sourdough discard, using an active, bubbly starter will often contribute to a slightly lighter texture and more pronounced sourdough tang. If using discard, ensure it’s not too old or inactive; a discard that’s been recently fed but not yet active is ideal.
- Ingredient Quality: Invest in high-quality cocoa powder and vanilla extract. These ingredients are key to the rich chocolate flavor. Dutch-processed cocoa powder will give a darker color and mellower chocolate taste, while natural cocoa powder offers a brighter, slightly more acidic chocolate flavor which can beautifully complement the sourdough tang.
- Pan Preparation: Always thoroughly grease and flour your baking pan. For extra assurance, you can line the bottom of the pan with parchment paper. This prevents sticking and ensures your beautiful cake can be easily removed.
- Don’t Overmix: As with most cakes, overmixing can lead to a tough texture. Mix the wet and dry ingredients just until they are combined. A few lumps are perfectly fine.
- Temperature Matters: Ensure your ingredients, especially the sour cream for the frosting and milk for the cake batter, are at room temperature. This helps them incorporate smoothly and creates a more consistent batter and frosting.
- Baking Time & Oven Calibration: Ovens can vary. Rely on the visual and tactile cues (cake springs back, skewer comes out clean) rather than strictly adhering to the baking time. Start checking a few minutes before the minimum recommended time.
- Cooling: Allow the cake to cool completely in the pan on a wire rack before frosting. Attempting to frost a warm cake will result in melted, messy frosting.
By keeping these tips in mind, you’ll not only bake a delicious sourdough chocolate cake but also deepen your understanding and appreciation for the unique characteristics that sourdough brings to the world of desserts.
Recipe

Sourdough Chocolate Cake
Anna
Pin Recipe
2 hours
30 minutes
40 minutes
3 hours
10 minutes
Dessert
American
8
Ingredients
-
½
cup
active
bubbly sourdough starter (120 grams) -
½
cup
whole milk
120 grams, at room temperature for best mixing -
1
cup
all-purpose flour
120 grams, unbleached preferred -
¾
cup
granulated sugar
150 grams -
½
cup
vegetable oil
or other neutral oil -
1
teaspoon
vanilla extract
pure vanilla extract for best flavor -
½
teaspoon
salt
fine sea salt or table salt -
¾
teaspoon
baking soda
fresh is best for leavening -
¼
cup
plus 2 tablespoons unsweetened natural type cocoa powder
32 grams, good quality makes a difference -
½
teaspoon
espresso powder
optional, but enhances chocolate flavor -
1
large egg
at room temperature
Frosting
-
4
tablespoons
of unsalted butter
softened to room temperature -
1
tablespoon
of sour cream
room temperature, full-fat for best results -
1 ½
cups
confectioners’ sugar
sifted or aerated before using for smooth frosting -
¼
cup
plus 2 tablespoons natural style cocoa powder
unsweetened -
1
pinch
of salt
balances sweetness -
½
teaspoon
vanilla extract
pure vanilla extract -
2 to 3
tablespoons
of half and half or a mixture of cream and whole milk
adjust for desired consistency
Instructions
-
In a large mixing bowl, thoroughly combine the sourdough starter, whole milk, and all-purpose flour. Stir until no dry streaks of flour remain. Cover the bowl with plastic wrap or a clean kitchen towel and let it rest at room temperature for 2 to 3 hours. During this period, the mixture should expand slightly, although it may not appear vigorously bubbly or active like a freshly fed starter. This step allows the sourdough to begin working its magic and developing flavor.
-
Preheat your oven to 350°F (175°C). Prepare an 8-inch square baking pan by greasing it generously with butter or baking spray, then lightly flouring it. If you prefer, you can also line the bottom with parchment paper for easy removal. If you are using a glass baking pan, reduce the oven temperature slightly to 325°F (160°C) as glass conducts heat more efficiently.
-
In a separate medium-sized mixing bowl, combine the granulated sugar, vegetable oil, vanilla extract, salt, baking soda, cocoa powder, and the optional espresso powder. Use a spoon or a rubber scraper to beat these ingredients together until they are well combined and form a thick paste. Next, add the large egg and continue to beat until everything is thoroughly blended. There’s no need for an electric mixer here; a little elbow grease works perfectly.
-
Gently scrape the rested sourdough mixture into the chocolate mixture. Stir thoroughly with your spoon or scraper until the two mixtures are fully incorporated and the batter is smooth. Be careful not to overmix at this stage; stir just until combined to ensure a tender cake.
-
Pour the prepared batter evenly into your greased and floured 8-inch square pan. Bake for 30 minutes at 350°F (175°C), or 40 minutes if baking at 325°F (160°C) in a glass pan. To check for doneness, gently touch the center of the cake; it should spring back lightly. Alternatively, insert a wooden skewer or toothpick into the center; it should come out clean. Once baked, remove the cake from the oven and let it cool completely on a wire rack before frosting.
-
For the Frosting: In a medium bowl, combine the softened unsalted butter, room temperature sour cream, sifted confectioners’ sugar, cocoa powder, and a pinch of salt. Add 2 tablespoons of the half and half (or milk and cream mixture). Begin mixing on low speed until the ingredients start to come together, forming a thick, somewhat sludgy consistency.
-
Once the frosting ingredients are sticking together, add the vanilla extract. Increase the mixer speed to medium-high and beat until the frosting is smooth and creamy. Stop periodically to scrape down the sides of the bowl. Add more half and half, one teaspoon at a time, as needed, until you achieve your desired texture and consistency – from thick and fudgy to lighter and spreadable. Spread the delicious cocoa frosting evenly over the cooled sourdough chocolate cake.
Chocolate Cake, Sourdough, Sourdough Discard, Dessert Recipe, Baking
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This Sourdough Chocolate Cake is more than just a dessert; it’s a testament to the versatility and unique characteristics that sourdough can bring to your baking repertoire. It’s an accessible and incredibly rewarding way to use up that discard starter, transforming it into a moist, flavorful, and unforgettable cake. Whether you’re a seasoned sourdough enthusiast or just beginning your journey, this recipe offers a delicious reason to keep your starter bubbly and your oven warm. Enjoy the process, and savor every exquisite bite!