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Close-up of fudgy sourdough brownies with crackly tops sliced in a 9x9 pan

Sourdough Brownies Recipe

This engineering-focused recipe solves the challenge of using sourdough discard in brownies, achieving an ultimate fudgy texture, a shimmering crackly top, and a subtle, sophisticated tang.
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Prep Time 25 minutes
Cook Time 35 minutes
Total Time 1 hour
Course Dessert
Cuisine American
Servings 16 squares
Calories 302 kcal

Equipment

  • 9" x 9" baking dish
  • Parchment paper
  • small saucepan
  • Large mixing bowl
  • Electric mixer
  • Manual spatula

Ingredients
  

Core Ingredients

  • 8 tablespoons unsalted butter
  • 12 oz. semi sweet chocolate chips
  • 1/2 cup dutched cocoa powder (or regular cocoa powder)
  • 2 teaspoons vanilla extract
  • 2 large eggs Ensure they are room temperature
  • 1 egg yolk Room temperature
  • 1 cup granulated sugar
  • 1/2 cup dark brown sugar
  • 1/2 cup sourdough starter discard Do not stir down; spoon directly into cup. Four-day-old discard is preferred for tang.
  • 1 cup all-purpose flour
  • 1 teaspoon salt

Instructions
 

Preparation and Melting

  • Preheat oven to 350°F (176°C) and line a 9" x 9" baking dish with parchment paper, leaving an overhang for easy removal.
  • Melt the butter in a small saucepan over low heat. Add the chocolate chips, vanilla extract, and dutched cocoa powder. Stir the ingredients until the chocolate chips have melted and the mixture is smooth. Remove the saucepan from the burner and set it aside to cool down slightly.

Precision Mixing Stages

  • In a large mixing bowl, beat the eggs, brown sugar, and granulated sugar with an electric mixer for 7-10 minutes until the mixture is pale, thick, and falls off the whisk in a slow ribbon (creating the air suspension).
  • Add the sourdough discard and the cooled chocolate mixture to the egg/sugar foam. Beat on low speed only until just combined.
  • Add the flour and salt. Switch to a manual spatula and gently fold the dry ingredients into the batter until they are just combined. Stop mixing immediately to prevent gluten development.

Baking and Cooling

  • Pour the thick batter into the prepared baking dish and smooth the top surface.
  • Bake for 35-40 minutes.
  • Allow the brownies to cool completely in the pan after they come out of the oven. This is crucial for achieving the fudgy texture.
  • Remove the brownies from the pan by lifting them with the parchment paper overhang and cut into 16 squares. Wipe your knife with a warm, damp cloth between every slice for the cleanest cuts.

Notes

For best flavor integration, allow the brownies to sit in an airtight container for 24 hours before serving. If using salted butter, reduce the added salt in the recipe to 1/2 teaspoon. To deepen the chocolate flavor without adding coffee taste, fold in 1 teaspoon of espresso powder with the dry ingredients.

Nutrition

Calories: 302kcalCarbohydrates: 39gProtein: 4gFat: 15g
Keyword baking science, fudgy brownies, tangy dessert
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