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Pat the fish fillets dry with paper towels to remove excess moisture.
Make the batter:
In a large bowl, whisk together flour, cornstarch, baking powder, salt, black pepper, paprika, garlic powder, and onion powder.
Beat the egg in a separate bowl and mix it into the dry ingredients. Gradually add cold water or club soda while whisking until the batter is smooth.
Fry the fish:
Heat vegetable oil in a deep skillet or frying pan to 350°F (175°C).
Dip each fish fillet into the batter, ensuring it is fully coated.
Fry the fillets 2–3 at a time for about 4–5 minutes per side, or until golden brown and cooked through. Drain on paper towels.
Serve:
Serve immediately with tartar sauce, lemon wedges, and sides like fries or coleslaw.