Sourdough Discard Brownies with Marshmallow

Highlighted under: Hearty Food Recipes

Delight in the rich, fudgy texture of these Sourdough Discard Brownies, topped with gooey marshmallows for a perfect sweet treat.

Lena

Created by

Lena

Last updated on 2025-12-27T21:54:28.318Z

Sourdough Discard Brownies are a delicious way to utilize leftover sourdough starter. These brownies are rich and fudgy, with a hint of tang from the sourdough. Topped with marshmallows, they are a perfect dessert for any gathering!

Why You'll Love This Recipe

  • Rich chocolate flavor paired with the tang of sourdough
  • Gooey marshmallows that create a delightful texture
  • Easy to make with leftover sourdough starter

The Perfect Use for Sourdough Discard

Many bakers find themselves wondering what to do with leftover sourdough starter. Instead of tossing it out, you can transform it into a delightful treat with these Sourdough Discard Brownies. The tangy flavor of the sourdough beautifully complements the rich chocolate, creating a unique dessert that stands out from traditional brownies. This recipe not only minimizes waste but also enhances your baked goods with depth and complexity.

Using sourdough discard in your brownies not only adds flavor but also contributes to a moist and fudgy texture. The acidity from the sourdough helps to balance the sweetness of the chocolate, making each bite a harmonious blend of flavors. Plus, incorporating sourdough into your baking is a fun way to experiment and discover new taste profiles.

Why Marshmallows Take These Brownies to the Next Level

The addition of mini marshmallows is what truly elevates these brownies. As they bake, the marshmallows become gooey and melty, creating delightful pockets of sweetness throughout the rich chocolate base. This contrast in textures—fudgy brownies with soft, fluffy marshmallows—makes for an irresistible dessert that is sure to please chocolate lovers and marshmallow fans alike.

Beyond their delicious flavor, marshmallows also add an eye-catching visual appeal to the brownies. As they brown slightly on top, they create a beautiful golden layer, inviting everyone to dig in. Whether you're serving these brownies at a party, a family gathering, or simply enjoying them at home, the marshmallows will undoubtedly capture the attention of your guests.

Tips for Perfect Brownies

To achieve the perfect brownie texture, be careful not to overmix the batter. Once you combine the dry ingredients with the wet ingredients, mix just until everything is incorporated. Overmixing can lead to tough brownies, which is not the goal. You want them to be soft, chewy, and fudgy—just like a brownie should be.

Another key tip is to let the brownies cool properly before cutting them into squares. Allowing them to cool for at least 10 minutes in the pan helps them set, making it easier to achieve clean cuts. If you’re looking for a truly indulgent experience, serve the brownies warm with a scoop of ice cream on top. The combination of warm brownies and cold ice cream is simply divine!

Ingredients

Gather these ingredients to make your brownies:

Brownies

  • 1 cup unsalted butter
  • 2 cups granulated sugar
  • 1 cup sourdough discard
  • 1 cup cocoa powder
  • 1 teaspoon vanilla extract
  • 4 large eggs
  • 1 cup all-purpose flour
  • 1 teaspoon baking powder
  • 1/2 teaspoon salt
  • 1 cup mini marshmallows

Ensure all ingredients are at room temperature for the best results.

Instructions

Follow these steps to bake your brownies:

Prepare the Oven and Pan

Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan or line it with parchment paper.

Melt the Butter

In a medium saucepan, melt the butter over low heat. Once melted, remove from heat and stir in the sugar, sourdough discard, and vanilla extract until well combined.

Add Eggs

Beat in the eggs one at a time, mixing well after each addition.

Combine Dry Ingredients

In a separate bowl, whisk together the flour, cocoa powder, baking powder, and salt.

Mix Everything Together

Gradually add the dry ingredients to the wet mixture, stirring just until combined.

Add Marshmallows

Fold in the mini marshmallows until evenly distributed.

Bake

Pour the batter into the prepared baking pan and spread it evenly. Bake for 25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.

Cool and Serve

Allow the brownies to cool in the pan for at least 10 minutes before cutting into squares and serving.

Enjoy your delicious sourdough brownies warm or at room temperature!

Storage and Enjoying Leftovers

Once your Sourdough Discard Brownies are cool, store them in an airtight container at room temperature for up to four days. To maintain their fudgy texture, avoid refrigerating them, as this can dry them out. If you want to keep them longer, consider freezing individual squares. Wrap them tightly in plastic wrap and then place them in a freezer-safe bag. They can be enjoyed straight from the freezer or warmed up in the microwave for a few seconds.

These brownies are perfect for sharing! Cut them into smaller squares and package them for gifts or bake sales. Their unique flavor profile will intrigue those who try them, and they’ll appreciate the use of sourdough discard, making these brownies a conversation starter.

Variations to Try

While the classic version of these brownies is delicious, feel free to get creative! Consider adding nuts, such as walnuts or pecans, for an added crunch. You can also mix in chocolate chips for a more intense chocolate experience. For a fun twist, try adding a swirl of peanut butter or caramel into the brownie batter before baking.

If you prefer a less sweet option, you can reduce the amount of sugar slightly or use a sugar substitute. Just keep in mind that this might alter the texture a bit. Experimenting with different flavors and mix-ins is part of the fun, so don’t hesitate to make this recipe your own!

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Questions About Recipes

→ Can I use regular flour instead of all-purpose flour?

Yes, you can use regular flour, but all-purpose flour works best for this recipe.

→ How do I store leftover brownies?

Store brownies in an airtight container at room temperature for up to 5 days.

→ Can I freeze these brownies?

Yes, you can freeze the brownies. Wrap them tightly in plastic wrap and store in a freezer-safe container for up to 3 months.

→ What can I substitute for marshmallows?

You can use chocolate chips or nuts as a substitute for marshmallows if desired.

Sourdough Discard Brownies with Marshmallow

Delight in the rich, fudgy texture of these Sourdough Discard Brownies, topped with gooey marshmallows for a perfect sweet treat.

Prep Time15 minutes
Cooking Duration25 minutes
Overall Time40 minutes

Created by: Lena

Recipe Type: Hearty Food Recipes

Skill Level: Beginner

Final Quantity: 12 brownies

What You'll Need

Brownies

  1. 1 cup unsalted butter
  2. 2 cups granulated sugar
  3. 1 cup sourdough discard
  4. 1 cup cocoa powder
  5. 1 teaspoon vanilla extract
  6. 4 large eggs
  7. 1 cup all-purpose flour
  8. 1 teaspoon baking powder
  9. 1/2 teaspoon salt
  10. 1 cup mini marshmallows

How-To Steps

Step 01

Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan or line it with parchment paper.

Step 02

In a medium saucepan, melt the butter over low heat. Once melted, remove from heat and stir in the sugar, sourdough discard, and vanilla extract until well combined.

Step 03

Beat in the eggs one at a time, mixing well after each addition.

Step 04

In a separate bowl, whisk together the flour, cocoa powder, baking powder, and salt.

Step 05

Gradually add the dry ingredients to the wet mixture, stirring just until combined.

Step 06

Fold in the mini marshmallows until evenly distributed.

Step 07

Pour the batter into the prepared baking pan and spread it evenly. Bake for 25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.

Step 08

Allow the brownies to cool in the pan for at least 10 minutes before cutting into squares and serving.

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