2 cups all-purpose flour
1/2 cup unsweetened cocoa powder
1 teaspoon baking soda
1 teaspoon salt
3/4 stick (6 tablespoons) unsalted butter, softened
1 cup granulated sugar
2 large eggs
1 cup walnuts, chopped
3/4 cup semisweet chocolate chips
1 tablespoon confectioners' sugar
