Begin by using a sharp knife to slice off the top of each garlic bulb just to expose the tops of the garlic cloves. You don't have to worry about the smaller cloves on the sides or making sure every clove is visible. You just want to slice enough off that you can drizzle olive oil between them.
Use your fingers to rub the papery skin off of the outside of the garlic bulbs.
Place the garlic bulbs on a piece of tinfoil large enough to fully wrap the cloves. You can place several in one piece of foil, or do each one separately.
Drizzle about 1 tablespoon of oil on each garlic bulb allowing the oil to drip down the sides and between the cloves.
Wrap the bulbs in the tinfoil making sure they are fully sealed.
Place the wrapped bulbs in the air fryer basket, place the basket in the air fryer and set it to 390°F.
Cook the garlic for 25-30 minutes, or until the garlic cloves are soft enough that a toothpick goes in easily. If after 30 minutes they aren't quite done, cook them an additional 2 minutes at a time until they are soft enough.
Remove the garlic from the air fryer and use as desired.