Chocolate Cookie Cutouts

1. Sift flour, cocoa powder, salt, and cinnamon into a bowl.

2. Put butter and confectioners’ sugar in the bowl of an electric mixer fitted with the paddle attachment. Mix on medium-high speed until pale and fluffy, about 3 minutes. Mix in egg and vanilla. Reduce speed to low. Gradually mix in flour mixture. Wrap dough in plastic wrap. Refrigerate until firm, 1 hour or overnight.

3. On a lightly floured work surface, roll out dough to 1/8 inch thick. Transfer to a parchment paper-lined baking sheet. Chill in freezer 15 minutes.

4. Preheat oven to 350 degrees F. Using a 3-inch cookie cutter, quickly cut out shapes from dough (if dough begins to soften, chill it in freezer 3 to 5 minutes). Reroll and cut scraps. Transfer shapes to prepared baking sheets, spacing them 2 inches apart. Brush flour from shapes. Sprinkle with nonpareils, if using. Chill in freezer until firm, about 15 minutes.

5. Bake cookies until crisp, about 8 minutes. Let cool completely on sheets on wire racks. Cookies can be stored between layers of parchment in an airtight container at room temperature up to 1 week.