Wash and scrape the peel off the ginger root using the edge of your spoon.
Cut the ginger into thin slices and pat them dry, removing as much moisture as you can. Arrange them in your Air Fryer basket.
Air fry the ginger for 20-30 minutes until they look like this, and are brittle.
Transfer them to a spice grinder or a blender jar and blitz for a few minutes.
Stop once the ground ginger reaches this texture.
Pass the ground ginger through a sieve to remove any bigger chunks.
Notes
Make sure you allow the ginger to cool down completely before you grind it. Not letting it cool down will cause the ginger to clump when it is processed.
Slice the ginger into thin slices to help it dry up quickly. Try to keep the slices as even as you can, to ensure that they all dry up at the same time.
Keep an eye on the ginger at the 20 minute mark. Overcooking it in the Air Fryer can cause a risk of it burning.
If despite air frying, the ginger hasn't crisped up as you want it to, pop the slices in the freezer for sometime until they're solid, and then grind them.