Preheat your air fryer to 400°F (200°C).
Slice the russet potato into thin wedges, then toss them in a bowl with half of the avocado oil and a pinch of sea salt.
Place the potato wedges in the air fryer basket and cook for 15-20 minutes, shaking halfway through, until they are golden and crisp.
While the potatoes cook, whisk together the all-purpose flour, light beer, garlic powder, and paprika in a shallow bowl until a smooth batter forms.
Pat the cod fillets dry with a paper towel and season both sides with the remaining sea salt and black pepper.
Dip each cod fillet into the beer batter, ensuring it is fully and evenly coated.
Lightly grease the air fryer basket with the remaining avocado oil, place the battered fish inside, and air fry at 375°F (190°C) for 10-12 minutes until the coating is crunchy and the fish flakes easily.
Serve the hot fish immediately alongside the hand-cut chips.