Preheat your oven to 425°F and line a large baking sheet with parchment paper.
Slice the potato into thin wedges and toss them in a bowl with 1 teaspoon of avocado oil and a pinch of sea salt.
Spread the potatoes in a single layer on the baking sheet and roast for 20 to 25 minutes until the edges are golden and crisp.
Pat the cod fillets completely dry with a paper towel to ensure the batter adheres properly and season with the remaining sea salt and black pepper.
In a shallow bowl, whisk the flour, garlic powder, and paprika together, then slowly pour in the light beer while whisking until a smooth, thick batter forms.
Heat the remaining 1 teaspoon of avocado oil in a large non-stick skillet over medium-high heat.
Dredge the fish fillets through the beer batter until fully coated and carefully place them in the hot skillet.
Sear the fish for 2 minutes on each side until the batter is set and lightly browned.
Move the seared fish to the baking sheet with the potatoes and bake for an additional 5 to 7 minutes until the fish is opaque and flakes easily with a fork.
Serve the fish and chips immediately with a fresh lemon wedge for a bright, zesty finish.