Preheat your air fryer to 400°F (200°C).
Slice the potato into even wedges and toss them with 0.25 tbsp of avocado oil, the dried parsley, and 0.125 tsp of the sea salt.
Place the potato wedges in the air fryer basket and cook for 15-18 minutes, shaking halfway through, until they are golden and crisp.
While the potatoes cook, pat the cod fillets completely dry with paper towels to ensure the batter adheres properly.
In a shallow bowl, whisk together the flour, garlic powder, paprika, black pepper, and the remaining 0.125 tsp of sea salt.
Slowly pour the light beer into the flour mixture, whisking constantly until a smooth, thick batter forms.
Dip each cod fillet into the batter, coating it thoroughly, and allow any excess to drip off.
Lightly brush the air fryer basket with the remaining 0.25 tbsp of avocado oil and place the battered fish inside.
Air fry the fish at 400°F for 10-12 minutes, flipping carefully halfway through, until the coating is shatteringly crisp and the fish is opaque.
Serve the hot fish and chips immediately with fresh lemon wedges for a bright, zesty finish.