Barefoot Contessa | Black & White Cookies | Recipes

Ingredients

• 10 tablespoons (1¼ sticks) unsalted butter, at room temperature
• 1 cup granulated sugar
• 1 extra-large egg, at room temperature
• 2 teaspoons pure vanilla extract
• 1¾ cups all-purpose flour
• ½ teaspoon baking powder
• ¼ teaspoon baking soda
• ½ teaspoon kosher salt
• ¹⁄₃ cup sour cream
• 4 tablespoons (½ stick) unsalted butter
• 5 ounces good semisweet chocolate, such as Lindt, roughly chopped
• ½ teaspoon instant coffee granules, such as Nescafé
• 2 cups sifted confectioners’ sugar
• 2 tablespoons light corn syrup
• ½ teaspoon pure vanilla extract
• 2 to 3 tablespoons heavy cream