Reduce the Apple Cider
Add 1–1½ cups apple cider to a small saucepan.
Simmer over medium heat for 15–20 minutes until thickened and reduced to about ¼ cup.
Set aside to cool completely.
Mix the Dry Ingredients
In a bowl, whisk together:
Flour
Baking soda
Salt
Cinnamon
Nutmeg
Allspice
Set aside.
Cream Butter and Sugars
In a mixing bowl, beat butter, brown sugar, and granulated sugar until light and fluffy.
Add the egg, vanilla, and cooled reduced apple cider.
Mix until smooth.
Combine Wet and Dry
Add dry ingredients to the wet mixture.
Mix until a soft dough forms.
Chill in the refrigerator for 30–40 minutes.
Shape and Bake
Preheat oven to 350°F (175°C).
Scoop dough into balls (1–1½ tbsp each) and place on a parchment-lined baking sheet.
Bake for 10–12 minutes, or until edges are lightly golden.
Coat in Cinnamon Sugar
Mix ¼ cup sugar with 1 tsp cinnamon.
Roll warm cookies in the cinnamon-sugar mixture for the apple cider donut finish.