Ingredients:

  • 1 cup unsalted butter (cubed)
  • 8 oz (225 g) high-quality dark chocolate, chopped (60-70% cocoa solids)
  • 1 cup granulated sugar
  • ½ cup light brown sugar, packed
  • 3 large eggs (room temperature)
  • 1 tsp vanilla extract
  • ¾ cup all-purpose flour (lightly measured)
  • ¼ cup unsweetened Dutch-Process cocoa powder
  • 1 tsp fine sea salt
  • ½ cup chocolate chips or chopped walnuts (optional mix-in)

Instructions:

  1. Prepare the Oven and Pan: Preheat oven to 350°F (175°C). Line an 8x8 inch pan with parchment paper, leaving an overhang on two sides for easy removal. Lightly grease the exposed paper.
  2. Melt the Base: Combine the butter and chopped dark chocolate in a heatproof bowl set over a saucepan of simmering water (double boiler). Stir until smooth and fully melted. Alternatively, melt slowly in the microwave in 30-second bursts.
  3. Cool Slightly: Remove the melted chocolate mixture from the heat. Allow it to cool for 2–3 minutes until it is still warm, but not piping hot.
  4. Introduce Sugar and Eggs: Whisk the granulated sugar and brown sugar into the warm chocolate mixture until combined.
  5. Whisk for Structure (The Magic): Crack the eggs into the mixture one at a time, whisking vigorously for 3 to 5 full minutes after the last egg is added. The mixture should thicken considerably, turn noticeably paler, and develop small visible air bubbles. This step is crucial for the crinkle crust.
  6. Add Vanilla: Stir in the vanilla extract.
  7. Sift the Dry Ingredients: In a separate bowl, whisk together the flour, cocoa powder, and salt.
  8. Combine Gently: Pour the dry mixture over the wet mixture. Use a rubber spatula to gently fold the ingredients together until just combined. Stop immediately when no streaks of dry flour remain. Do not overmix!
  9. Add Mix-Ins: Fold in any optional chocolate chips or nuts.
  10. Bake: Pour the batter into the prepared pan, spreading evenly. Bake for 30–35 minutes.
  11. Test for Doneness: The edges should look set, and a thin crust should have formed across the top. A toothpick inserted into the center should come out with moist, fudgy crumbs clinging to it, not wet batter.
  12. Cool Completely: Remove from the oven and transfer the pan to a wire rack. Allow the brownies to cool completely in the pan for at least 60 minutes before slicing. Do not cut them warm.