Preheat your oven to 425°F and line a baking sheet with parchment paper.
Slice the potato into wedges, toss with olive oil, salt, and pepper, then roast for 25 minutes until golden and crisp.
Pat the cod fillets dry with a paper towel to ensure the batter adheres properly to the surface.
In a shallow bowl, whisk together the brown rice flour, garlic powder, and paprika.
Gradually pour the light beer into the flour mixture, whisking until a smooth, thick batter forms.
Dip each cod piece into the batter, then lightly pan-sear in a non-stick skillet over medium-high heat until the exterior is crunchy and the fish is opaque.
Steam the peas until bright green and serve immediately alongside the hot fish and chips.