Preheat the air fryer to 400°F.
Slice the russet potato into 1/2-inch thick wedges and toss with 1 teaspoon of avocado oil and a pinch of the sea salt.
Place the potato wedges in the air fryer basket in a single layer and cook for 15-18 minutes until golden and crisp.
While potatoes cook, pat the cod fillets dry with paper towels to ensure the batter adheres properly.
In a shallow bowl, whisk together the flour, garlic powder, paprika, and black pepper.
Slowly whisk the beer into the flour mixture until a thick, smooth batter forms.
Dip each cod fillet into the batter, allowing the excess to drip off, and lightly coat the exterior with the remaining avocado oil.
Place the battered fish into the air fryer and cook at 380°F for 10-12 minutes until the coating is golden and the fish flakes easily.
Season the fish and chips with the remaining sea salt and serve immediately while hot.