Step 1: In a large mixing bowl, whisk together the flour, cornstarch, baking powder, baking soda, salt, sugar, onion powder, garlic powder, and turmeric until well combined.
Step 2: Pat your fish or chicken pieces completely dry with paper towels to ensure the Crispy Long John’s Silver Style Fish & Chicken Batter sticks.
Step 3: Heat 2-3 inches of oil in a heavy-bottomed pot or deep fryer to 375°F (190°C).
Step 4: Just before frying, pour the ice-cold club soda into the dry ingredients. Whisk gently until just combined; do not overmix (lumps are okay).
Step 5: Dredge each piece of fish or chicken lightly in a little extra dry flour, then dip into the Crispy Long John’s Silver Style Fish & Chicken Batter, coating thoroughly.
Step 6: Carefully lower the battered pieces into the hot oil. Drizzle a spoonful of extra batter over the pieces while they fry to create ‘crunchies’.
Step 7: Fry for 3-5 minutes per side until the batter is deep golden brown and the internal temperature of the protein is safe.
Step 8: Remove with a slotted spoon and drain on a wire rack (not paper towels) to maintain the Crispy Long John’s Silver Style Fish & Chicken Batter texture.