Fill a large pot with water and bring it to a boil over high heat. Carefully add the eggs and cook for 11–12 minutes until fully hard boiled.

Transfer the eggs to a bowl of cold water or an ice bath and allow them to cool slightly. Peel the shells once cool enough to handle.

Using a knife, cut vertical slits along the egg whites, being careful not to cut too deep into the yolks. This helps the marinade and spices absorb better and prevents them from exploding in the air fryer.

In a large mixing bowl, whisk together the oyster sauce, fish sauce, soy sauce, sugar, lime juice, and water until well combined.

Add the eggs to the marinade and gently toss to coat. Let the eggs marinate for about 10 minutes, turning occasionally so the seasoning distributes evenly.

Preheat the air fryer to 300°F (150°C). Place the marinated eggs in the air fryer basket in a single layer and cook for 7 minutes.

Sprinkle the eggs with chili powder, paprika, cumin, garlic powder, onion powder, salt, and oregano. Toss gently so the spices coat evenly. (Alternatively, remove the eggs to a bowl, mix with the spices, then return them to the air fryer.) Cook for another 7 minutes

Once finished, remove the eggs and allow them to cool slightly before putting them on skewers (if desired).

Garnish with scallion oil, grated Parmesan, and a squeeze of fresh lime before serving.