Fit the tinfoil to the air fryer basket and fold any extra tinfoil over. Then flip over the tinfoil so that the popcorn kernels don't get stuck in the seam.
Layer the popcorn kernels in a single layer in the air fryer basket.
Cook at 400°F/200°C for 8 minutes.
Notes
You will want to shake the air fryer often to avoid any burning.