In a large bowl using a hand mixer or mixing stand beat together butter and brown sugar.
Slowly add the vanilla extract and egg yolk. Then add in the molasses. Mixing well.
Next, carefully and one at a time: add the flour, baking soda, cinnamon, ginger, ground nutmeg, and salt. Beat until everything is completely mixed. Be sure to scrape the sides and avoid any lumps.
Cover dough and refrigerate for at least an hour.
After an hour remove the dough from the fridge.
Preheat the air fryer to 300 degrees F.
Line air fryer basket with parchment paper.
Portion dough into smaller round balls. Add confectioners sugar to a small bowl and granulated sugar to a separate small bowl.
Dip each cookie ball lightly in to granulated sugar and then completely in to confectioner’s sugar making sure to roll it around and cover it.
Place on parchment paper a few inches apart, and cook in the air fryer for about ten minutes.
The outside should start to crinkle but be puffy. The outside should also be slightly crisp while the inside remains soft!
Allow to cool before serving!