Espresso-Chocolate Shortbread Cookies Ingredients 1 tablespoon instant espresso powder 1 tablespoon boiling water 2 sticks (8 ounces) unsalted butter, at room temperature 2/3 cup confectioners’ sugar 1/2 teaspoon pure vanilla extract 2 cups all-purpose flour 4 ounces bittersweet chocolate (plain, or a toffee variety), finely chopped, or 3/4 cup store-bought mini chocolate chips Confectioners’