1/2 pound (2 sticks) unsalted butter
14 ounces semisweet chocolate chips (divided into 8 ounces & 6 ounces)
3 ounces unsweetened chocolate
3 large eggs
1 tablespoon plus 1 teaspoon powdered instant espresso
1 tablespoon vanilla extract
1 cup plus 2 tablespoons sugar
1/2 cup all-purpose flour
1/2 tablespoon baking powder
1/2 teaspoon salt
1-1/2 cups chopped walnuts
Preheat the oven to 350 degrees.
Butter and flour a 13″X 9″ baking sheet.
Melt together the butter, 8 ounces of chocolate chips, and the unsweetened chocolate in a double boiler. Remove from heat and let cool to almost room temperature.
In a large bowl, stir (do not beat) together the eggs, powdered espresso, vanilla, and sugar. Stir in the cooled chocolate mixture into the egg mixture and set aside.
In a medium bowl, sift together the flour, the baking powder, and salt. Add to the cooled chocolate mixture. Fold in the walnuts and remaining 6 ounces of chocolate chips. Pour into the baking sheet.
Bake for 15 minutes, then open the oven, lift the backing sheet and rap it against the oven shelf to force the air to escape from between the pan and the brownie dough. Turn the pan around and rap the other side. (This stops the rising process and will give the brownies their deliciously dense texture.) Bake another 15 or so minutes, just until a toothpick comes out clean – do not overbake.
Allow to cool thoroughly, refrigerate, and cut into squares.
Note: This recipe is from the Barefoot Contessa cookbook but her version was double in size and used a 12×18 jelly roll pan, which Mom did. So the baking time of 30 minutes for a halved recipe and 13×9 pan is approximate. Also note that these are very rich.