Preheat your air fryer to 400°F (200°C).
Slice the russet potato into thin wedges, toss them with 1 teaspoon of olive oil and a pinch of sea salt, then air fry for 15 minutes until golden and tender.
While the potatoes cook, pat the cod fillets completely dry with a paper towel and season with garlic powder and paprika.
In a small bowl, whisk together the flour and light beer until a smooth, thick batter forms that coats the back of a spoon.
Dip each cod fillet into the batter to coat thoroughly, then lightly brush or spray the exterior with the remaining teaspoon of olive oil.
Lower the air fryer temperature to 375°F (190°C), place the fish in the basket (ensuring they don't touch), and cook for 10-12 minutes until the crust is crunchy and the fish flakes easily.
Serve the hot fish and chips immediately with a fresh lemon wedge on the side.