Ingredients

  • 1 cup (2 sticks) unsalted butter
  • 8 ounces bittersweet (not unsweetened) or semisweet chocolate, chopped
  • 3 ounces unsweetened chocolate, chopped
  • 1/2 cup all purpose flour
  • 1 1/2 teaspoons baking powder
  • 1/2 teaspoon salt
  • 1 cup plus 2 tablespoons sugar
  • 3 large eggs
  • 3 1/4 teaspoons instant espresso powder or instant coffee powder
  • 1 tablespoon vanilla extract
  • 1 1/4 cups chopped toasted walnuts
  • 6 ounces bittersweet (not unsweetened) or semisweet chocolate, coarsely chopped

Method

  • Preheat oven to 350F.
  • Butter 13 x 9 x 2-inch glass baking dish.
  • Melt first 3 ingredients in heavy medium saucepan over low heat, stirring until smooth.
  • Remove from heat.
  • Let cool 10 minutes.
  • Sift flour, baking powder and salt into medium bowl.
  • Using electric mixer, beat sugar, eggs, espresso powder and vanilla in large bowl until blended.
  • Add melted chocolate mixture and beat until smooth.
  • Add dry ingredients and stir just until blended.
  • Fold in walnuts and 6 ounces coarsely chopped chocolate.
  • Pour batter into prepared pan.
  • Smooth top.
  • Bake until top looks dry and tester inserted into center comes out with moist crumbs attached, about 30 minutes.
  • Transfer pan to rack and cool completely.
  • (Can be made 1 day ahead.
  • Cover with foil and store at room temperature.)
  • Cut brownies into squares and serve.