Ingredients:

  • 1 cup (227g) unsalted butter, cut into cubes
  • 1 cup (120g) all-purpose flour
  • ½ cup (45g) unsweetened cocoa powder
  • ¼ teaspoon salt
  • ¼ teaspoon baking powder
  • 1 cup (200g) granulated sugar
  • ½ cup (100g) packed light brown sugar
  • 3 large eggs
  • 2 teaspoons vanilla extract
  • ½ cup (85g) semi-sweet chocolate chunks (optional)

Instructions:

  1. Preheat oven to 350°F (175°C). Line an 8x8 inch baking pan with parchment paper, leaving an overhang on the sides.
  2. Melt butter in a saucepan over medium heat. Continue cooking, swirling occasionally, until it turns golden brown and smells nutty (about 5-8 minutes). Watch carefully to prevent burning!
  3. Pour the browned butter into a heatproof bowl and let it cool slightly (about 5 minutes).
  4. Whisk together flour, cocoa powder, salt, and baking powder in a separate bowl.
  5. Whisk granulated sugar and brown sugar into the cooled brown butter.
  6. Whisk in the eggs one at a time, then stir in the vanilla extract.
  7. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix!
  8. Gently fold in the chocolate chunks (if using).
  9. Pour the batter into the prepared baking pan and spread evenly.
  10. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out with moist crumbs attached.
  11. Let cool completely in the pan before lifting out using the parchment paper overhang. Cut into 16 squares and serve.