There’s something satisfying about whipping up a sweet treat after a long day. Sourdough blondies offer a wonderful way to enjoy a dessert that’s both comforting and simple to make. With a tender, chewy texture and a rich flavor that comes from brown sugar, these blondies are perfect for enjoying on weeknights, weekends, or during gatherings with friends and family. They work beautifully for quiet moments, too, allowing for a nice indulgence that feels rewarding but not overly complicated. Let’s dive into this delightful recipe.
Why You’ll Love This Sourdough Blondies
Sourdough blondies are easy to make and provide reliable results, making them a great choice for both novice and experienced bakers. Their warm, comforting flavor balances beautifully with the slight tanginess from the sourdough starter. This practical treat can brighten any day and fit seamlessly into your everyday routine, offering a reliable recipe that’s worth returning to time and again.
Kitchen Tools You’ll Need
- Mixing bowls
- Whisk
- Measuring cups
- Measuring spoons
- Baking pan
Ingredients
- 1 cup unsalted butter, melted (adds moisture and richness)
- 1 cup brown sugar (provides sweetness and a deep flavor)
- 1/2 cup granulated sugar (balances sweetness and adds texture)
- 2 large eggs (binds ingredients and adds moisture)
- 1 teaspoon vanilla extract (enhances flavor)
- 1 cup all-purpose flour (provides structure)
- 1/2 teaspoon baking powder (adds lift and lightness)
- 1/2 teaspoon baking soda (helps with leavening)
- 1/2 teaspoon salt (enhances overall flavor)
- 1 cup sourdough starter discard (adds moisture and a slight tang)
- 1 cup chocolate chips (optional; adds sweetness and texture)
How to Make Sourdough Blondies
Step 1. Start by melting the unsalted butter in a saucepan over low heat, or in a microwave-safe bowl in the microwave. Melt it just until it’s fully liquid, then allow it to cool slightly. This ingredient brings moisture and richness to your blondies.
Step 2. In a mixing bowl, whisk together the melted butter, brown sugar, and granulated sugar until it forms a smooth mixture. It should look glossy and slightly thick. This step is important for incorporating the sugars fully, ensuring the blondies have the right sweetness and texture.
Step 3. Next, add the large eggs one at a time, whisking well after each addition. Then mix in the vanilla extract. The eggs will help bind the ingredients together, creating a rich and cohesive batter.
Step 4. In another bowl, combine the all-purpose flour, baking powder, baking soda, and salt. Stir the dry ingredients together until well mixed. This ensures that the leavening agents are evenly distributed throughout the flour, which is key to achieving a consistent texture.
Step 5. Gradually add the dry mixture to the wet ingredients, stirring gently until just incorporated. Be careful not to overmix; the batter should be combined but may still have some lumps. This will help maintain the chewy texture of the blondies.
Step 6. Finally, fold in the sourdough starter discard. Mix it gently until everything is combined. The sourdough starter contributes moisture and a subtle tang, giving the blondies a unique flavor that sets them apart from traditional recipes.
Step 7. If you’re using chocolate chips, add them now and fold them into the batter until evenly distributed. This adds little pockets of sweetness and texture throughout the blondies.
Step 8. Pour the batter into a prepared baking pan, smoothing the top with a spatula. Make sure it’s evenly spread so that your blondies bake uniformly. This will lead to consistent texture across the entire batch.
Step 9. Bake in a preheated oven until the edges are set and the center is slightly soft, about 20 to 25 minutes. The top should look golden, and you can check for doneness by lightly pressing the center—if it springs back, it’s ready. Let them cool slightly in the pan before transferring to a wire rack to cool completely.

Serving Suggestions
Sourdough blondies are versatile enough to enjoy in various situations. They make a delightful breakfast option with a cup of coffee or tea, offering a touch of sweetness to start the day. As a snack, they’re ideal for kids coming home from school or for a cozy movie night with family. Leftovers can be stored for a quick treat to enjoy on busy days, and they also make a friendly addition to potlucks or gatherings with friends.
Pro Tips for Best Results
- Ensure the butter is not too hot when mixing it with the sugars to avoid cooking the eggs.
- Gently fold the flour to keep the blondies tender; overmixing can lead to a tougher texture.
- Using room-temperature eggs will help them incorporate more smoothly into the batter.
- Let the blondies cool completely before cutting to achieve cleaner edges.
Common Mistakes to Avoid
- Overmixing the batter can lead to tough blondies due to overdeveloped gluten. Mix until just combined for a tender texture.
- Not measuring ingredients accurately may result in an imbalanced recipe. Use proper measuring cups and spoons to ensure accuracy.
- Skipping the cooling step may cause them to fall apart when cutting. Allowing them to cool helps them firm up.
- Using cold ingredients can affect how well the butter and sugars incorporate. Bring ingredients like eggs and butter to room temperature first.
- Baking for too long can dry out the blondies. Watch for the edges to set while the center remains soft as a cue for doneness.
- Neglecting to grease or line the baking pan can lead to sticking, making it difficult to remove the blondies. Lining with parchment paper is a simple remedy.
Variations & Substitutions
While this recipe is simple, you can enhance it by adding nuts for extra crunch or swapping chocolate chips for butterscotch or white chocolate for different flavors. Including spices like cinnamon or espresso powder can also enhance the taste without adding new ingredients.
Storage & Reheating
These blondies can be stored at room temperature in an airtight container for about three days. For longer storage, keep them in the refrigerator for up to a week. They also freeze well for up to three months; just wrap them tightly in plastic wrap and place them in a resealable bag. To reheat, place a blondie in the microwave for a few seconds, just until warm, which helps restore its chewy texture.
Frequently Asked Questions
Can I make this recipe ahead of time?
Absolutely! Sourdough blondies can be made a day or two in advance. Just store them in an airtight container at room temperature or in the refrigerator. They’ll stay soft and delicious, making them a great option for prepping ahead.
How long does it last in the fridge?
These blondies can last in the fridge for about a week when stored in an airtight container. They maintain their taste and texture well, allowing you to enjoy them over several days.
Can I freeze this recipe?
Yes, you can freeze these blondies for up to three months. Wrap them tightly in plastic wrap and place them in a freezer-safe bag for best results. Simply thaw at room temperature before enjoying.
What can I substitute for one ingredient?
If you need to substitute butter, you can use equal amounts of coconut oil or vegetable oil for a different flavor profile. Just be mindful that it may slightly alter the texture.
Why didn’t my recipe turn out as expected?
A few factors can lead to unexpected results. Common issues include improper ingredient measurements, overmixing, or not allowing the blondies to cool adequately before cutting. Following the recipe closely will help achieve better results.
Final Thoughts
Making sourdough blondies is a straightforward process that can bring a bit of warmth into your home. They offer a delicious treat that is easy to prepare and wonderfully satisfying to enjoy. Whether relishing them solo or sharing with loved ones, these blondies can brighten your day. There’s comfort in simplicity, and these blondies surely deliver that in every bite.

Sourdough Blondies
Ingredients
Main Ingredients
- 1 cup unsalted butter, melted Adds moisture and richness
- 1 cup brown sugar Provides sweetness and a deep flavor
- 1/2 cup granulated sugar Balances sweetness and adds texture
- 2 large eggs Binds ingredients and adds moisture
- 1 teaspoon vanilla extract Enhances flavor
- 1 cup all-purpose flour Provides structure
- 1/2 teaspoon baking powder Adds lift and lightness
- 1/2 teaspoon baking soda Helps with leavening
- 1/2 teaspoon salt Enhances overall flavor
- 1 cup sourdough starter discard Adds moisture and a slight tang
- 1 cup chocolate chips Optional; adds sweetness and texture
Instructions
Preparation
- Start by melting the unsalted butter in a saucepan over low heat, or in a microwave-safe bowl in the microwave. Melt it just until it’s fully liquid, then allow it to cool slightly.
- In a mixing bowl, whisk together the melted butter, brown sugar, and granulated sugar until it forms a smooth mixture.
- Add the eggs one at a time, whisking well after each addition, and then mix in the vanilla extract.
- In another bowl, combine the all-purpose flour, baking powder, baking soda, and salt. Stir the dry ingredients together until well mixed.
- Gradually add the dry mixture to the wet ingredients, stirring gently until just incorporated.
- Fold in the sourdough starter discard until everything is combined.
- If using, add the chocolate chips and fold them into the batter.
- Pour the batter into a prepared baking pan, smoothing the top with a spatula.
Baking
- Bake in a preheated oven until the edges are set and the center is slightly soft, about 20 to 25 minutes.
- Let them cool slightly in the pan before transferring to a wire rack to cool completely.


