Make the Coating: In a large bowl, whisk together cornstarch, flour, rice flour, baking powder, garlic powder, ginger powder, white pepper, salt. In another bowl, beat the egg.
1 cup potato cornstarch, ½ cup all-purpose flour, ½ cup rice flour, 1 teaspoon baking powder, 1 teaspoon garlic powder, 1 teaspoon ginger powder, ½ teaspoon white pepper, 1/2 teaspoon salt, 2 eggs