Preheat your oven to 425°F and line a baking sheet with parchment paper.
Slice the potato into uniform wedges and toss them with 0.5 tbsp of avocado oil and a pinch of sea salt.
Spread the potatoes on the baking sheet and roast for 20-25 minutes, flipping halfway through, until they are golden and crispy.
While the potatoes roast, pat the cod fillets very dry with paper towels to ensure the batter adheres properly.
In a small mixing bowl, whisk together the arrowroot powder, almond flour, garlic powder, paprika, sea salt, and black pepper.
Slowly whisk in the light beer until a smooth, thick batter forms.
Heat the remaining 0.5 tbsp of avocado oil in a non-stick skillet over medium-high heat.
Dip each cod fillet into the batter, allowing any excess to drip off, and carefully place in the hot skillet.
Cook the fish for 3-4 minutes per side until the crust is deeply golden and the fish flakes easily with a fork.
Serve the crispy fish immediately alongside the hot roasted potato wedges.