Preheat the air fryer: Set it to 350°F (175°C). A warm air fryer helps the batter puff quickly and prevents sticking.
Make the batter: In a small bowl, whisk pancake mix with milk or water until smooth and slightly thick—think yogurt or heavy cream consistency. If using, add a splash of vanilla and one egg per package directions.
Prep the basket: Lightly spray the air fryer basket with cooking spray or brush with a thin layer of oil.
This keeps the batter from bonding to the grate.
Dip the Oreos: Use a fork or tongs to submerge each Oreo in the batter, coating completely. Let excess drip off so the coating isn’t too heavy.
Arrange and cook: Place coated Oreos in a single layer with a little space between. Air fry for 4–5 minutes, then gently flip and cook another 2–4 minutes until golden and puffed.
Check doneness: They should be lightly browned, with a set, springy coating.
If pale, add 1–2 more minutes.
Dust and serve: Transfer to a plate, dust with powdered sugar, and serve warm. They’re best fresh, when the center is gooey.