Ingredients:

  • 1 cup (227g) unsalted butter, cut into cubes
  • 8 ounces (227g) bittersweet chocolate (70% cacao), chopped
  • 1 cup (200g) granulated sugar
  • ½ cup (100g) packed light brown sugar
  • 4 large eggs
  • 2 teaspoons vanilla extract
  • ¾ cup (90g) all-purpose flour
  • ½ cup (45g) unsweetened cocoa powder
  • ¼ teaspoon baking powder
  • ¼ teaspoon salt
  • ½ cup (85g) chocolate chips (optional)

Instructions:

  1. Preheat oven to 350°F (175°C). Line an 8x8 inch baking pan with parchment paper, leaving an overhang.
  2. Melt butter and bittersweet chocolate in a double boiler or heatproof bowl over simmering water, stirring until smooth. Remove from heat.
  3. Whisk in granulated sugar and brown sugar until well combined.
  4. Beat in eggs one at a time, then stir in vanilla extract.
  5. In a separate bowl, whisk together flour, cocoa powder, baking powder, and salt. Gradually add to wet ingredients, mixing until just combined.
  6. Gently fold in chocolate chips, if using.
  7. Pour batter into the prepared pan and spread evenly.
  8. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs attached.
  9. Cool completely in the pan before lifting out using the parchment paper overhang. Cut into squares and serve.