Sourdough Discard Brownies Peanut (Printer View)

Moist fudgy chocolate brownies with peanut butter swirl, enhanced with sourdough discard for rich texture.

# What you'll need:

→ Chocolate & Butter

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

→ Wet Ingredients

03 - 1/2 cup sourdough discard (unfed)
04 - 1 cup granulated sugar
05 - 2 large eggs
06 - 1 teaspoon vanilla extract

→ Dry Ingredients

07 - 1/2 cup all-purpose flour
08 - 1/4 cup unsweetened cocoa powder
09 - 1/2 teaspoon fine sea salt

→ Swirl

10 - 1/3 cup creamy peanut butter
11 - 1 tablespoon powdered sugar (optional)

# Method:

01 - Preheat oven to 350°F. Line an 8x8 inch square baking pan with parchment paper.
02 - In a microwave-safe bowl, combine butter and chocolate chips. Heat in 30-second intervals, stirring between each burst until completely melted and smooth. Allow to cool for 3 minutes.
03 - In a large mixing bowl, whisk together sourdough discard, granulated sugar, eggs, and vanilla extract until fully incorporated.
04 - Pour the cooled chocolate mixture into the wet ingredients bowl and whisk until the batter becomes smooth and homogeneous.
05 - Sift flour, cocoa powder, and salt into the batter. Fold gently with a spatula until just combined, avoiding overmixing.
06 - Transfer batter into the prepared pan and smooth the surface evenly.
07 - In a small bowl, combine peanut butter with powdered sugar if desired. Drop spoonfuls of the peanut butter mixture across the brownie batter. Using a skewer or knife, gently swirl the peanut butter into the batter in decorative patterns.
08 - Bake for 28 to 32 minutes until the center is just set. A toothpick inserted should emerge with moist crumbs, not wet batter.
09 - Allow brownies to cool completely in the pan before cutting into 16 equal squares.

# Expert Advice:

01 -
  • Perfect way to use up sourdough discard instead of wasting it
  • Incredibly fudgy texture with a subtle tangy undertone
  • Ready in just 45 minutes from start to finish
  • The peanut butter swirl adds beautiful marbling and flavor contrast
  • Easy enough for beginners, impressive enough for guests
02 -
  • Use room temperature sourdough discard for easier mixing and better incorporation
  • Don't overmix the batter once you add the flour—this keeps brownies fudgy rather than cakey
  • For the prettiest swirl, drop peanut butter in dollops across the surface, then swirl in a figure-eight pattern
  • Test for doneness at 28 minutes—the toothpick should have moist crumbs, not come out clean
  • Let brownies cool completely before cutting for the cleanest slices
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