cup (76g) butter, softened 牛油, cup packed light brown sugar 淺黑糖, eggs 雞蛋, cup sour cream 酸忌廉, teaspoon vanilla 香草精, cup unsweetened cocoa powder 無糖可可粉, teaspoon baking soda 梳打粉, teaspoon salt 鹽, cups all-purpose flour 麵粉, cup (6 ounces) semisweet chocolate chips 半甜巧克力粒, Powdered sugar 糖粉