Chocolate Hazelnut Sourdough Brownies

Highlighted under: Artisanal Baking Recipes

I absolutely love making these Chocolate Hazelnut Sourdough Brownies when I'm craving something decadent yet unique. The combination of chocolate and toasted hazelnuts adds an unexpected twist to traditional brownies. Using sourdough starter not only gives the brownies a distinct flavor but also helps create a fudgy texture that's irresistibly moist. Every bite is a delightful experience, making them perfect for sharing with friends or enjoying on a cozy evening at home.

Anna

Created by

Anna

Last updated on 2026-01-27T14:34:28.865Z

When I first experimented with incorporating sourdough into brownies, I was amazed at how the flavors melded together. The tanginess from the sourdough perfectly offsets the rich chocolate, creating a balance that’s both intriguing and delicious. I discovered that allowing the batter to rest for a short while enhances the depth of flavor, so I recommend resisting the urge to bake them immediately!

To make these brownies even more special, I like to use high-quality dark chocolate and freshly toasted hazelnuts. The added crunch from the nuts gives a wonderful texture contrast to the softness of the brownie. Don’t skip the sea salt sprinkle on top; it truly elevates the entire dessert!

Why You'll Love These Brownies

  • Rich chocolate flavor paired with crunchy hazelnuts
  • Fudgy texture enhanced by sourdough fermentation
  • Perfect for impressing guests or treating yourself

Understanding Sourdough's Role

Incorporating sourdough starter into brownies might seem unconventional, but it plays a vital role in achieving their unique flavor and texture. The fermentation process enhances the depth of chocolate, adding a subtle tang that beautifully balances the sweetness of sugar. Additionally, the active cultures in the starter contribute to the brownies’ moistness, ensuring they stay fudgy even a few days after baking. Don't skip this ingredient for the best outcome!

If you're worried about using up your sourdough starter, it’s a great opportunity to use discard that might otherwise go to waste. Just make sure your sourdough is active; this will ensure your brownies rise properly and maintain an appealing structure. If using an inactive starter, consider feeding it and waiting until it bubbles up before integrating it into your batter.

Texture and Flavor Tips

To achieve that perfect fudgy texture, be careful not to overmix your brownie batter. When you combine the wet and dry ingredients, mix only until no dry flour is visible. Overmixing can lead to a dense and cake-like texture, which is not what we want in these luxurious brownies. Visual cues, like a somewhat thick yet pourable batter, can guide you to the right consistency.

When folding in the chopped dark chocolate and hazelnuts, take your time. You want these delicious add-ins evenly distributed throughout the batter for maximum flavor in every square. Indeed, if you prefer an even richer flavor, consider using a combination of dark and semi-sweet chocolate or even adding a splash of espresso powder to intensify the chocolatey depth.

Storage and Serving Suggestions

These brownies can be stored in an airtight container at room temperature for up to five days, although they are best enjoyed fresh! If you're aiming to keep them longer, they freeze exceptionally well. Wrap individual squares in plastic wrap and place them in a freezer-safe bag; they'll stay fresh for up to three months. When you're ready to indulge, let them thaw at room temperature or pop them in the microwave for a few seconds to enjoy that warm, gooey texture again.

When it comes to serving, these brownies are delightful on their own, but I love to elevate them with a scoop of vanilla ice cream or a drizzle of salted caramel sauce. You can also sprinkle additional toasted hazelnuts on top for added crunch and presentation. For a fun twist, consider adding a layer of Nutella on top before serving – it harmonizes wonderfully with the chocolate and hazelnut theme.

Ingredients

Ingredients for Chocolate Hazelnut Sourdough Brownies

Brownie Base

  • 1 cup all-purpose flour
  • 1/2 cup unsweetened cocoa powder
  • 1 cup granulated sugar
  • 1/2 cup unsalted butter, melted
  • 1/4 cup sourdough starter
  • 3 large eggs
  • 1 teaspoon vanilla extract
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon salt
  • 3/4 cup dark chocolate, chopped
  • 1/2 cup hazelnuts, toasted and roughly chopped

Instructions

Instructions

Preheat the Oven

Preheat your oven to 350°F (175°C) and grease a 9x9-inch baking pan or line it with parchment paper.

Mix Wet Ingredients

In a mixing bowl, combine melted butter, sugar, eggs, sourdough starter, and vanilla extract. Whisk until well combined.

Combine Dry Ingredients

In another bowl, sift together flour, cocoa powder, baking powder, and salt.

Incorporate Dry into Wet

Gradually fold the dry ingredients into the wet mixture until just blended. Do not overmix.

Add Chocolate and Hazelnuts

Fold in the chopped dark chocolate and hazelnuts, ensuring even distribution in the batter.

Bake the Brownies

Pour the batter into the prepared baking pan and spread it evenly. Bake for 30 minutes or until a toothpick comes out with a few moist crumbs.

Cool and Serve

Allow the brownies to cool in the pan for at least 15 minutes before cutting into squares. Enjoy!

Pro Tips

  • For extra flavor, try adding a tablespoon of espresso powder to enhance the chocolate. Don’t forget to let the brownies cool completely before slicing to avoid crumbling.

Common Mistakes and Troubleshooting

If your brownies turn out cakey rather than fudgy, it’s likely due to overmixing or baking them for too long. Aim for a moist toothpick – it should have a few moist crumbs clinging to it to ensure the brownies remain gooey at the center. If they seem underbaked after the suggested time, extend baking in two-minute increments, checking frequently.

Always use a greased pan or parchment paper! This prevents your brownies from sticking, allowing you to cut perfect squares without any hassle. If you find they’re clinging to the sides too much, consider letting them cool in the pan longer or using a plastic knife to help gently separate them from the edges before removing.

Ingredient Variations

Feel free to experiment with the nuts in this recipe! While hazelnuts bring a beautiful crunch and flavor, walnuts or pecans can be equally delicious substitutes. If you're looking for a nut-free version, consider adding chocolate chips for texture or even toffee bits for a different flavor profile.

For those avoiding gluten, substituting all-purpose flour with a 1:1 gluten-free mix works well without sacrificing much in terms of texture. Just ensure that the blend contains xanthan gum or another binding agent to replicate the stretchiness of gluten.

Questions About Recipes

→ Can I use a different type of nut?

Absolutely! Walnuts or pecans would work wonderfully as well.

→ What can I substitute for sourdough starter?

You can use plain yogurt or buttermilk for a similar effect, but the flavor will differ slightly.

→ How should I store the brownies?

Store them in an airtight container at room temperature for up to four days, or refrigerate for a week.

→ Can I freeze these brownies?

Yes! Wrap them tightly in plastic and store in the freezer for up to three months.

Chocolate Hazelnut Sourdough Brownies

I absolutely love making these Chocolate Hazelnut Sourdough Brownies when I'm craving something decadent yet unique. The combination of chocolate and toasted hazelnuts adds an unexpected twist to traditional brownies. Using sourdough starter not only gives the brownies a distinct flavor but also helps create a fudgy texture that's irresistibly moist. Every bite is a delightful experience, making them perfect for sharing with friends or enjoying on a cozy evening at home.

Prep Time20 minutes
Cooking Duration30 minutes
Overall Time50 minutes

Created by: Anna

Recipe Type: Artisanal Baking Recipes

Skill Level: Intermediate

Final Quantity: 12 brownies

What You'll Need

Brownie Base

  1. 1 cup all-purpose flour
  2. 1/2 cup unsweetened cocoa powder
  3. 1 cup granulated sugar
  4. 1/2 cup unsalted butter, melted
  5. 1/4 cup sourdough starter
  6. 3 large eggs
  7. 1 teaspoon vanilla extract
  8. 1/2 teaspoon baking powder
  9. 1/4 teaspoon salt
  10. 3/4 cup dark chocolate, chopped
  11. 1/2 cup hazelnuts, toasted and roughly chopped

How-To Steps

Step 01

Preheat your oven to 350°F (175°C) and grease a 9x9-inch baking pan or line it with parchment paper.

Step 02

In a mixing bowl, combine melted butter, sugar, eggs, sourdough starter, and vanilla extract. Whisk until well combined.

Step 03

In another bowl, sift together flour, cocoa powder, baking powder, and salt.

Step 04

Gradually fold the dry ingredients into the wet mixture until just blended. Do not overmix.

Step 05

Fold in the chopped dark chocolate and hazelnuts, ensuring even distribution in the batter.

Step 06

Pour the batter into the prepared baking pan and spread it evenly. Bake for 30 minutes or until a toothpick comes out with a few moist crumbs.

Step 07

Allow the brownies to cool in the pan for at least 15 minutes before cutting into squares. Enjoy!

Extra Tips

  1. For extra flavor, try adding a tablespoon of espresso powder to enhance the chocolate. Don’t forget to let the brownies cool completely before slicing to avoid crumbling.

Nutritional Breakdown (Per Serving)

  • Calories: 380 kcal
  • Total Fat: 26g
  • Saturated Fat: 15g
  • Cholesterol: 195mg
  • Sodium: 85mg
  • Total Carbohydrates: 32g
  • Dietary Fiber: 3g
  • Sugars: 24g
  • Protein: 6g