Triple Chocolate Sourdough Brownies (Printable Version)

Fudgy, rich brownies with a sourdough twist and layers of chocolate and espresso flavors.

# What You'll Need:

→ 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)
06 - 1/2 cup unsalted butter, cubed
07 - 2 large eggs
08 - 1 tsp vanilla extract
09 - 2 tbsp strong brewed espresso or 1 tbsp instant espresso powder dissolved in 2 tbsp 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 tsp fine sea salt

# Steps:

01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - In a heatproof bowl, combine bittersweet chocolate and butter. Melt over a double boiler using gently simmering water, stirring until smooth. Remove from heat and cool slightly.
03 - Whisk both sugars into the melted 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 the wet mixture until just combined. Avoid overmixing.
06 - Fold milk chocolate and white chocolate pieces into the batter.
07 - Pour batter into the prepared pan and smooth the top.
08 - Bake for 32–36 minutes until the center is just set and a toothpick inserted comes out with moist crumbs.
09 - Cool completely in the pan before lifting out and cutting into 12 equal squares.

# Expert Advice:

01 -
  • The sourdough starter adds a subtle tang that deepens the chocolate flavor instead of making it sweet—it's like a flavor secret nobody sees coming.
  • Three kinds of chocolate create layers of richness: bittersweet for depth, milk chocolate for smoothness, white chocolate for balance and texture.
  • Espresso isn't just a background note; it makes the chocolate sing louder and more complex, even though you won't taste coffee directly.
02 -
  • If you underbake by even three minutes, the brownies stay gooey inside the pan; wait for that tiny wiggle at the center and trust it—they firm up as they cool.
  • Refrigerating the cooled brownies for a few hours before cutting makes them fudgier and easier to slice cleanly because the chocolate hardens and the crumb sets tighter.
03 -
  • Always use a slightly damp knife to slice cooled brownies; it cuts through cleanly instead of dragging and tearing the crumb.
  • If you don't have strong brewed espresso, instant espresso powder dissolved in hot water works identically—the flavor intensity is what matters, not the format.
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