Long John Silver’s batter

Long John Silver’s batter
Ingredients:
1 cup all-purpose flour
1 cup cornstarch
2 teaspoons baking powder
1 teaspoon salt
1 teaspoon sugar
1/4 teaspoon baking soda
1/4 teaspoon onion powder
1/4 teaspoon garlic powder
1 cup club soda, cold
Directions:
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