Makes about 4 dozen 1-inch cookies
1 cup cooked chestnuts
1 cup (2 sticks or 8 ounces) unsalted butter, room temperature
2 cups powdered sugar
2 teaspoons vanilla extract
1/4 teaspoon ground cinnamon + additional for coating
A few gratings of fresh nutmeg
1/8 teaspoon salt
2 cups all purpose flour
Chop-chop-chop those chestnuts as fine as you can, then use an electric mixer to whip the butter and 1/2 cup powdered sugar. Add the vanilla, 1/4 teaspoon cinnamon, nutmeg, salt, flour and chestnuts and beat until well blended.]
Divide dough and wrap each half in plastic, chilling for one hour or until firm. Once chilled, preheat the oven to 350°F.
Whisk remaining 1 1/2 cups powdered sugar and a few pinches of cinnamon in a small bowl. Set aside. Working with one half of the chilled dough at at time, roll it into 2 teaspoon-sized balls in the palm of your hand.
Arrange on parchment-lined baking sheet but no need to leave more than 1/2 inch between the cookies; they won’t spread.
Bake cookies until golden brown on bottom and just pale golden on top, about 14 to 17 minutes.
Cool cookies 5 minutes on baking sheet.
Gently toss warm cookies in cinnamon sugar to coat completely. Transfer coated cookies to rack and cool completely.
To touch them up before serving, you can sift some of the leftover cinnamon-sugar mixture over them.
Do ahead: Dough can be chilled in the fridge for a day or two, longer in the freezer. Chestnuts can be roasted in advance, kept at room temperature for a day or so. Cookies will keep in an airtight container at room temperature for a week.