Preheat your air fryer to 400°F.
Slice the russet potato into thin wedges and toss them in a bowl with half of the avocado oil, sea salt, and paprika.
Place the potato wedges in the air fryer basket in a single layer and cook for 15-18 minutes, shaking halfway through, until they are browned and crispy.
While the chips cook, whisk together the flour, baking powder, garlic powder, and black pepper in a shallow bowl.
Slowly whisk the light beer into the flour mixture until a thick, smooth batter forms.
Pat the cod fillets completely dry with a paper towel and season lightly with a pinch of sea salt.
Dip each cod fillet into the batter, ensuring it is fully and evenly coated.
Lightly grease the air fryer rack with the remaining avocado oil to prevent sticking.
Place the battered cod in the air fryer and cook at 375°F for 10-12 minutes, carefully flipping once, until the coating is golden-brown and the fish is opaque.