Preheat your air fryer to 400°F (200°C).
Cut the russet potato into thin wedges, then toss them in a bowl with 1 tsp of avocado oil, 0.25 tsp salt, and 0.25 tsp paprika.
Arrange the potato wedges in a single layer in the air fryer basket and cook for 15-18 minutes, shaking halfway through.
In a shallow bowl, whisk together the all-purpose flour, garlic powder, and the remaining paprika.
Slowly pour the light beer into the flour mixture, whisking until a smooth, thick batter forms.
Pat the cod fillets dry with paper towels and season with the remaining salt and black pepper.
Dip each cod fillet into the beer batter, ensuring it is fully coated on all sides.
Lightly brush the air fryer tray with the remaining 1 tsp of avocado oil, place the fish inside, and cook at 375°F for 10-12 minutes until the crust is golden and crisp.