Preheat your air fryer to 400°F (200°C).
Wash and cut the potato into 1/2-inch thick wedges, then pat them completely dry with a paper towel.
In a small bowl, toss the potato wedges with 1 teaspoon of avocado oil, half of the salt, and half of the pepper.
Place the wedges in the air fryer basket in a single layer and cook for 15-18 minutes, shaking halfway through, until they are crisp and golden.
While the chips cook, whisk together the flour, beer, garlic powder, paprika, and the remaining salt and pepper in a shallow dish until a smooth batter forms.
Pat the cod fillets dry with paper towels to ensure the batter sticks, then dip each piece into the batter to coat thoroughly.
Lightly grease the air fryer rack with the remaining teaspoon of avocado oil or an oil spray.
Place the battered cod in the air fryer (you may need to move the chips to one side or cook in batches) and cook at 400°F for 8-10 minutes, flipping gently halfway, until the coating is crunchy and the fish flakes easily.