Sourdough Discard Brownies Peanut

Featured in: Easy Sweet Options

These fudgy brownies combine melted chocolate and butter with sourdough discard to create a moist, rich texture. The batter includes sugar, eggs, and vanilla for balanced sweetness and depth. A gentle swirl of creamy peanut butter adds a luscious, nutty contrast to each bite. Baked until just set, they yield a tender, indulgent treat perfect for sharing. Optional variations include adding nuts or chocolate chips for texture, or swapping peanut butter for a nut-free alternative.

Updated on Fri, 27 Feb 2026 18:49:09 GMT
Fudgy sourdough discard brownies swirled with creamy peanut butter, perfect for using up sourdough starter leftovers. Rich chocolate brownies with a moist crumb and luscious peanut butter topping. Decadent brownies featuring a peanut butter swirl and sourdough discard for extra depth of flavor. Save to Pinterest
Fudgy sourdough discard brownies swirled with creamy peanut butter, perfect for using up sourdough starter leftovers. Rich chocolate brownies with a moist crumb and luscious peanut butter topping. Decadent brownies featuring a peanut butter swirl and sourdough discard for extra depth of flavor. | cozylouz.com

There's something magical about transforming sourdough discard into decadent desserts, and these fudgy brownies are the perfect example. Instead of tossing out your leftover starter, you can bake up a batch of incredibly moist, rich chocolate brownies with a stunning peanut butter swirl. The sourdough discard adds depth and a subtle tang that perfectly complements the sweet chocolate and creamy peanut butter, creating a brownie that's anything but ordinary.

Fudgy sourdough discard brownies swirled with creamy peanut butter, perfect for using up sourdough starter leftovers. Rich chocolate brownies with a moist crumb and luscious peanut butter topping. Decadent brownies featuring a peanut butter swirl and sourdough discard for extra depth of flavor. Save to Pinterest
Fudgy sourdough discard brownies swirled with creamy peanut butter, perfect for using up sourdough starter leftovers. Rich chocolate brownies with a moist crumb and luscious peanut butter topping. Decadent brownies featuring a peanut butter swirl and sourdough discard for extra depth of flavor. | cozylouz.com

These brownies prove that sourdough discard is a baker's secret weapon. The unfed starter brings moisture and a unique flavor complexity that makes these brownies stand out from traditional recipes. Whether you're an avid sourdough baker looking for creative ways to use your discard or simply someone who loves a good brownie, this recipe delivers on all fronts.

Ingredients

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  • Chocolate & Butter: 115 g (1/2 cup) unsalted butter, 170 g (1 cup) semisweet chocolate chips or chopped chocolate
  • Wet Ingredients: 120 g (1/2 cup) sourdough discard (unfed), 200 g (1 cup) granulated sugar, 2 large eggs, 1 tsp vanilla extract
  • Dry Ingredients: 65 g (1/2 cup) all-purpose flour, 30 g (1/4 cup) unsweetened cocoa powder, 1/2 tsp fine sea salt
  • Swirl: 80 g (1/3 cup) creamy peanut butter, 1 tbsp powdered sugar (optional, for a sweeter swirl)

Instructions

Step 1
Preheat your oven to 175°C (350°F). Line a 20x20 cm (8x8 inch) square pan with parchment paper.
Step 2
In a microwave-safe bowl, melt the butter and chocolate together in 30-second bursts, stirring until smooth. Let cool for 3 minutes.
Step 3
In a large bowl, whisk together the sourdough discard, sugar, eggs, and vanilla until well combined.
Step 4
Pour the melted chocolate mixture into the bowl and whisk until smooth.
Step 5
Sift in the flour, cocoa powder, and salt. Mix gently with a spatula until just combined—do not overmix.
Step 6
Pour the batter into the prepared pan and smooth the top.
Step 7
In a small bowl, stir together peanut butter and powdered sugar (if using) until smooth. Drop spoonfuls of the peanut butter mixture over the brownie batter. Use a skewer or knife to gently swirl the peanut butter into the batter.
Step 8
Bake for 28–32 minutes, or until the center is just set and a toothpick comes out with moist crumbs.
Step 9
Let cool completely in the pan before slicing into squares.

Zusatztipps für die Zubereitung

The key to perfectly fudgy brownies is not overbaking them. When you insert a toothpick into the center, you want to see moist crumbs rather than wet batter or completely clean results. The brownies will continue to set as they cool in the pan. Letting the melted chocolate cool for a few minutes before adding it to the other wet ingredients prevents the eggs from cooking. When mixing in the dry ingredients, use a gentle folding motion with your spatula and stop as soon as you no longer see streaks of flour—overmixing will result in cakey rather than fudgy brownies. For the most beautiful swirl pattern, use a skewer or knife to create figure-eight motions through the batter, being careful not to drag the peanut butter all the way to the bottom of the pan.

Varianten und Anpassungen

This recipe is wonderfully adaptable to your preferences and dietary needs. For a nut-free version, simply omit the peanut butter or replace it with sunflower seed butter for a similar creamy swirl. If you love extra chocolate, fold in an additional 1/2 cup of chocolate chips into the batter before baking, or sprinkle chopped nuts like walnuts or pecans over the top for added crunch and texture. You can also experiment with different nut butters—almond butter or cashew butter both create delicious swirls with slightly different flavor profiles. For an even more indulgent treat, press a few pieces of your favorite candy bar into the batter before baking. The beauty of this recipe is that the sourdough discard base remains constant while you customize the flavors to your liking.

Serviervorschläge

These brownies are delicious on their own, but there are plenty of ways to elevate them into an extra-special dessert. Serve warm brownies with a scoop of vanilla ice cream for a classic combination that never disappoints—the cold ice cream melting into the warm, fudgy brownie is pure bliss. For a more elegant presentation, dust the cooled brownies with powdered sugar or drizzle with melted chocolate. They also pair beautifully with a dollop of whipped cream and fresh berries. If you're serving them for a party, cut them into smaller bite-sized pieces and arrange on a platter. These brownies keep well at room temperature in an airtight container for up to 4 days, or you can refrigerate them for up to a week. They also freeze beautifully for up to 3 months—just wrap individual squares in plastic wrap and store in a freezer bag.

Fudgy sourdough discard brownies swirled with creamy peanut butter, perfect for using up sourdough starter leftovers. Rich chocolate brownies with a moist crumb and luscious peanut butter topping. Decadent brownies featuring a peanut butter swirl and sourdough discard for extra depth of flavor. Save to Pinterest
Fudgy sourdough discard brownies swirled with creamy peanut butter, perfect for using up sourdough starter leftovers. Rich chocolate brownies with a moist crumb and luscious peanut butter topping. Decadent brownies featuring a peanut butter swirl and sourdough discard for extra depth of flavor. | cozylouz.com

These sourdough discard brownies with peanut butter swirl are proof that the best recipes often come from resourcefulness. What started as a way to avoid wasting sourdough starter has become a beloved treat that's requested again and again. The combination of rich chocolate, tangy sourdough, and creamy peanut butter creates a flavor profile that's both familiar and excitingly different. Whether you're making them to use up discard or simply because they're delicious, these brownies are sure to become a staple in your baking repertoire.

Recipe FAQ

What role does sourdough discard play?

It enhances moisture and adds subtle tang, contributing to a rich, tender texture in the brownies.

Can I substitute peanut butter?

Yes, sunflower seed butter works well as a nut-free alternative for the swirl.

How should I know when brownies are done?

They are ready when the center is set but still moist, emerging toothpick crumbs indicate perfect doneness.

Is there a way to add extra texture?

Incorporate chocolate chips or chopped nuts into the batter for added crunch and richness.

What baking tools are recommended?

Use a square baking pan lined with parchment, mixing bowls, a whisk, spatula, and a skewer for swirling.

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Sourdough Discard Brownies Peanut

Rich chocolate brownies enhanced with sourdough discard and a luscious peanut butter swirl for extra flavor.

Prep time
15 minutes
Time for cooking
30 minutes
Overall time
45 minutes
Created by Christopher Keating


Skill level Easy

Cuisine type American

Portions 16 Number of servings

Diet requirements Vegetarian-friendly

What you’ll need

Chocolate & Butter

01 1/2 cup unsalted butter
02 1 cup semisweet chocolate chips or chopped chocolate

Wet Ingredients

01 1/2 cup sourdough discard, unfed
02 1 cup granulated sugar
03 2 large eggs
04 1 teaspoon vanilla extract

Dry Ingredients

01 1/2 cup all-purpose flour
02 1/4 cup unsweetened cocoa powder
03 1/2 teaspoon fine sea salt

Swirl

01 1/3 cup creamy peanut butter
02 1 tablespoon powdered sugar, optional

Steps

Step 01

Preheat and Prepare Pan: Preheat oven to 350°F. Line an 8x8 inch square baking pan with parchment paper.

Step 02

Melt Chocolate and Butter: In a microwave-safe bowl, melt butter and chocolate together in 30-second intervals, stirring until completely smooth. Allow to cool for 3 minutes.

Step 03

Combine Wet Ingredients: In a large mixing bowl, whisk together sourdough discard, granulated sugar, eggs, and vanilla extract until thoroughly combined.

Step 04

Incorporate Chocolate Mixture: Pour the cooled melted chocolate mixture into the wet ingredient bowl and whisk until the batter is smooth and uniform.

Step 05

Add Dry Ingredients: Sift flour, cocoa powder, and salt into the chocolate mixture. Gently fold with a spatula until just combined, being careful not to overmix.

Step 06

Transfer Batter: Pour the batter into the prepared pan and smooth the surface with a spatula.

Step 07

Create Peanut Butter Swirl: In a small bowl, mix peanut butter with powdered sugar if desired until smooth. Drop spoonfuls of the peanut butter mixture over the brownie batter. Use a skewer or knife to gently swirl the peanut butter throughout the batter.

Step 08

Bake Brownies: Bake for 28 to 32 minutes, or until the center is just set and a toothpick inserted comes out with moist crumbs.

Step 09

Cool and Cut: Allow brownies to cool completely in the pan before slicing into 16 squares.

What you’ll need

  • Mixing bowls
  • Whisk
  • Spatula
  • 8x8 inch square baking pan
  • Parchment paper
  • Microwave or stovetop for melting chocolate
  • Skewer or knife for creating swirl pattern

Allergy info

Read each ingredient label for potential allergens and reach out to your doctor if you’re uncertain.
  • Contains wheat and gluten
  • Contains eggs
  • Contains milk products from butter and chocolate
  • Contains peanuts

Nutrition info (for one serving)

These numbers are just for reference and can’t substitute medical guidance.
  • Calorie count: 210
  • Fat content: 13 g
  • Carbohydrates: 23 g
  • Protein: 4 g

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