In a mixing bowl, combine the flour and salt. Add the egg and a small amount of milk; whisk together to break the yolk and begin forming the batter.

Gradually pour in the remaining milk while continuing to whisk. Keep whisking until the batter is smooth. Allow the batter to rest for 30 minutes; this helps develop the structure for a better rise.

Five minutes before you're ready to cook, place the ramekins in the air fryer basket and generously spray them with oil to coat the insides. Preheat the air fryer to 380°F (193°C) with the ramekins inside for 5 minutes.

After preheating, give the Yorkshire pudding batter a quick whisk and pour it into the ramekins, filling them halfway.

Cook Yorkshire puddings in air fryer at 380°F (193°C) for 8 minutes. Then, gently flip the puddings using tongs and cook for an additional 3-5 minutes.

After three minutes, use the tongs to check the puddings by feeling their weight. They should feel light; if they feel heavy, continue cooking for up to 2 more minutes.

Serve the Air Fryer Yorkshire Pudding hot and fresh alongside your favorite roast. Add a simple brown gravy to enhance the savory flavors.