If you’re looking for a rich, moist dessert that also helps reduce kitchen waste, this sourdough discard chocolate cake is about to become your new favorite. It transforms leftover sourdough starter into a deeply chocolatey cake with incredible texture and just a hint of tang that makes every bite extra special.
Why You’ll Love This Sourdough Discard Chocolate Cake
This cake is everything a homemade chocolate dessert should be—easy, comforting, and full of flavor. The sourdough discard doesn’t make it taste sour; instead, it enhances the chocolate and keeps the cake ultra-moist. It’s perfect for birthdays, casual gatherings, or those moments when you just need a reliable chocolate fix.
Even better, this recipe uses simple pantry ingredients and comes together in one bowl, making it ideal for beginner bakers and busy home cooks alike.
Ingredients You’ll Need
For the Cake
- 1 cup sourdough discard (unfed, room temperature)
- 1 cup granulated sugar
- ½ cup packed brown sugar
- ¾ cup unsweetened cocoa powder
- 1 teaspoon baking soda
- ¼ teaspoon salt
- 2 large eggs, room temperature
- ⅓ cup vegetable oil or melted coconut oil
- 2 teaspoons vanilla extract
- ½ cup brewed coffee or hot water
- 1 cup all-purpose flour
Optional Chocolate Frosting
- ½ cup unsalted butter, softened
- 1¾ cups powdered sugar
- ¼ cup unsweetened cocoa powder
- 2–3 tablespoons milk or cream
- 1 teaspoon vanilla extract
- Pinch of salt
How to Make Sourdough Discard Chocolate Cake (Step-by-Step)
Step 1: Prep the Pan
Preheat your oven to 350°F (175°C). Grease an 8- or 9-inch round cake pan and line the bottom with parchment paper for easy removal.
Step 2: Mix the Dry Ingredients
In a large bowl, whisk together the cocoa powder, baking soda, salt, and flour until evenly combined.
Step 3: Combine the Wet Ingredients
Add the sourdough discard, granulated sugar, brown sugar, eggs, oil, and vanilla to the bowl. Mix until smooth and glossy.
Step 4: Add the Liquid
Slowly pour in the hot coffee or water, stirring gently. The batter will be thin—this is what gives the cake its tender crumb.
Step 5: Bake
Pour the batter into the prepared pan. Bake for 30–35 minutes, or until a toothpick inserted in the center comes out with just a few moist crumbs.
Step 6: Cool & Frost
Allow the cake to cool completely before frosting. If using the frosting, beat all frosting ingredients together until light and creamy, then spread evenly over the cake.
Tips & Variations
- No Coffee? Hot water works perfectly and won’t affect the chocolate flavor.
- Extra Chocolate: Add chocolate chips to the batter for pockets of melted goodness.
- Dairy-Free: Use plant-based butter and milk for the frosting.
- Lighter Texture: Sift the cocoa powder before mixing to prevent lumps.
- Cupcakes: This batter also works beautifully for cupcakes—bake 18–20 minutes.
Serving Ideas & Storage
Serve this sourdough discard chocolate cake as-is, dusted with powdered sugar, or topped with fresh berries for contrast. It pairs wonderfully with a glass of milk or a warm cup of tea.
Storage:
- Room temperature: up to 2 days (covered)
- Refrigerator: up to 5 days
- Freezer: wrap slices tightly and freeze for up to 2 months
Sourdough Discard Chocolate Cake
- Total Time: 50 minutes
- Yield: 8 servings 1x
- Diet: Vegetarian
Description
Rich, moist, and deeply chocolatey, this Sourdough Discard Chocolate Cake is an easy no-waste dessert. The sourdough discard adds a subtle tang that boosts the cocoa flavor, making it perfect for weeknight treats, parties, or anytime a chocolate craving hits.
Ingredients
1 cup (240g) sourdough discard (unfed starter, room temperature)
1 cup (200g) granulated sugar
1/2 cup (100g) brown sugar, packed
3/4 cup (65g) unsweetened cocoa powder
1 teaspoon baking soda
1/4 teaspoon salt
2 large eggs, room temperature
1/3 cup (80ml) vegetable oil (or melted coconut oil)
2 teaspoons vanilla extract
1/2 cup (120ml) brewed coffee or hot water
1 cup (120g) all-purpose flour
Optional Frosting:
1/2 cup (115g) unsalted butter, softened
1 3/4 cups (175g) powdered sugar
1/4 cup (25g) unsweetened cocoa powder
2–3 tablespoons milk or cream
1 teaspoon vanilla extract
A pinch of salt
Instructions
1. Preheat oven to 350°F (175°C). Grease an 8- or 9-inch round cake pan and line the bottom with parchment paper.
2. In a large bowl, whisk together cocoa powder, baking soda, salt, and flour.
3. Add sourdough discard, granulated sugar, brown sugar, eggs, oil, and vanilla. Mix until smooth.
4. Slowly stir in the hot coffee (or hot water) until fully combined. Batter will be thin.
5. Pour batter into prepared pan and bake 30–35 minutes, until a toothpick comes out with a few moist crumbs.
6. Cool in the pan 10 minutes, then turn out onto a rack to cool completely.
7. Optional frosting: Beat butter until creamy. Add powdered sugar, cocoa, vanilla, and salt. Add milk/cream 1 tbsp at a time until spreadable.
8. Frost cooled cake, slice, and serve.
Notes
Coffee deepens the chocolate flavor but can be replaced with hot water.
For dairy-free frosting, use plant-based butter and dairy-free milk.
For extra chocolate, fold in 1/2 cup chocolate chips before baking.
Storage: cover and keep at room temp up to 2 days, refrigerate up to 5 days, or freeze slices up to 2 months.
Nutrition values are estimates and will vary based on pan size and frosting amount.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 slice
- Calories: 320
- Sugar: 32g
- Sodium: 220mg
- Fat: 15g
- Saturated Fat: 5g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 45g
- Fiber: 4g
- Protein: 5g
- Cholesterol: 55mg
Nutrition Facts (Per Serving)
| Nutrient | Amount |
|---|---|
| Calories | ~320 |
| Protein | 5g |
| Carbohydrates | 45g |
| Fat | 15g |
| Fiber | 4g |
| Sodium | 220mg |
Final Thoughts
This sourdough discard chocolate cake proves that baking with sourdough starter doesn’t have to be complicated. It’s a cozy, reliable dessert that feels special without extra effort—and a delicious way to make sure your sourdough discard never goes to waste.