Triple Chocolate Sourdough Brownies (Print Version)

Fudgy, sourdough-infused brownies blending three chocolates with a rich espresso touch.

# Components:

→ Chocolate & Cocoa

01 - 3.5 oz bittersweet chocolate (60–70% cacao), chopped
02 - 1.75 oz milk chocolate, chopped
03 - 1.75 oz white chocolate, chopped
04 - 1/4 cup unsweetened cocoa powder

→ Sourdough & Wet Ingredients

05 - 1/2 cup sourdough starter (100% hydration, unfed or discard acceptable)
06 - 1/2 cup unsalted butter, cubed
07 - 2 large eggs
08 - 1 teaspoon vanilla extract
09 - 2 tablespoons strong brewed espresso or 1 tablespoon instant espresso powder dissolved in 2 tablespoons hot water

→ Dry Ingredients

10 - 3/4 cup granulated sugar
11 - 1/4 cup light brown sugar, packed
12 - 3/4 cup all-purpose flour
13 - 1/2 teaspoon fine sea salt

# Directions:

01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving overhang on sides for easy removal.
02 - Combine bittersweet chocolate and butter in a heatproof bowl. Place bowl over a saucepan of gently simmering water, stirring until completely smooth. Remove from heat and cool slightly.
03 - Whisk granulated sugar and brown sugar into the chocolate mixture until combined. Add eggs one at a time, whisking thoroughly after each addition. Stir in vanilla extract and espresso.
04 - Fold sourdough starter into the wet mixture until fully incorporated.
05 - Sift together flour, cocoa powder, and salt. Gently fold dry ingredients into wet mixture until just combined. Avoid overmixing.
06 - Fold milk chocolate and white chocolate pieces into the batter.
07 - Pour batter into prepared pan and smooth the top with a spatula.
08 - Bake for 32–36 minutes until center is just set and a toothpick inserted in the middle comes out with moist crumbs.
09 - Cool brownies completely in the pan before lifting out using parchment overhang. Cut into 12 equal squares.

# Expert Advice:

01 -
  • The sourdough adds a subtle tang that makes the chocolate taste even more complex, like you've discovered a secret layer.
  • Three kinds of chocolate means every bite feels indulgent without tasting one-dimensional.
  • They're fudgy enough to feel homemade but structured enough to slice cleanly, which is harder than it sounds.
02 -
  • The sourdough starter doesn't need to be fed or at peak activity—discard starter works perfectly here, which means you can finally use up that jar without guilt.
  • Baking them for exactly 32–36 minutes is the difference between fudgy and dry; set a timer and don't go guessing, because ovens vary and so do brownie edges.
03 -
  • Weighing your ingredients, especially flour and sourdough starter, makes these consistent every time—baking scales are worth the investment for bakers.
  • Room temperature eggs and melted chocolate that's cooled just slightly create a batter that's silky and incorporates beautifully instead of becoming grainy.
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