Preheat your air fryer to 400°F to ensure a hot start for the potatoes.
Slice the Russet potato into thin wedges and toss them in a bowl with the olive oil and a pinch of sea salt.
Arrange the potato wedges in a single layer in the air fryer basket and cook for 15 minutes until they are golden and crispy.
While the chips cook, pat the cod fillets thoroughly dry with paper towels to ensure the batter adheres properly.
In a shallow dish, whisk together the almond flour, arrowroot powder, garlic powder, paprika, sea salt, and black pepper.
Gently pour the light beer into the dry mixture, whisking until you achieve a thick, bubbly batter consistency.
Dredge each cod fillet into the batter, turning to coat every side completely.
Remove the potatoes from the air fryer and set aside; lightly grease the basket with a spray of oil.
Place the battered fish into the air fryer and cook at 375°F for 10-12 minutes, flipping halfway, until the exterior is crunchy and the fish flakes easily.
Plate the hot fish alongside the crispy chips and serve immediately for the best texture.