GERMAN SPICE COOKIES (PFEFFERNUSSE)

Steps:

• Cookies: Preheat oven to 350 degrees. Line three baking sheets with parchment paper.
• In a medium bowl, combine flour, baking soda, and spices. Set aside.
• In the bowl of an electric mixer fitted with the paddle attachment, beat together butter, brown sugar, and molasses on medium speed until fluffy, about 3 minutes. Beat in egg and vanilla. With mixer on low speed, add flour mixture; beat until just combined. Pinch off a heaping teaspoon of dough, roll into a ball, and place on a prepared baking sheet. Repeat process with remaining dough, spacing balls 1 1/2 inches apart. (Dough can be frozen at this point, covered tightly with plastic wrap, up to 1 month.)
• Bake, rotating sheets halfway through, until cookies are golden and firm to the touch with slight cracking, about 15 minutes. Transfer sheets to a wire rack to cool completely.
• Glaze: Fit a rimmed baking sheet with a wire rack. In a medium bowl, whisk together confectioners' sugar, milk, and kirsch, if desired. Using a fork, dip each cookie in glaze to coat. Tap to remove excess glaze and place on wire rack to dry. Repeat with remaining cookies.
• To decorate: While the glaze is still wet, top cookies with a small pinch of peppercorns, if desired. Alternatively, let glaze dry completely before mixing together luster dust and kirsch with a small paintbrush. Lightly brush tops of cookies with luster dust mixture, if desired. Let dry before serving. Cookies can be stored in an airtight container at room temperature up to 2 weeks.