1Preheat the air fryer to 193°C (380°F) for 5 minutes.
2In a bowl, mix half the flour with salt, garlic powder, smoked paprika, and Old Bay. In another bowl, combine the remaining flour with baking powder, then add the egg and beer and mix well until a thick batter forms that sticks to the spoon.
3Pat the fish pieces dry with paper towels. Coat each piece in the seasoned flour mixture, covering well.
4Dip the floured fish into the beer batter, coating both sides. Lift the piece and let excess batter drip off.
5Coat the fish again in the remaining dry flour to prevent sticking. Line the air fryer basket with parchment paper and give a light spray of olive oil.
6Place the fish in the basket and spray oil on top (otherwise the flour remains dry). Cook for 12 minutes, then turn the pieces, spray more oil, and cook for another 2–3 minutes.
7Serve immediately with tartar sauce for the crispiest crust.