Combine 2 teaspoons kosher salt, 1/4 cup cornstarch, and 1/2 teaspoon baking powder in a large bowl and whisk until homogenous. Add chicken wings and toss until every surface is coated. Transfer wings to a wire rack set in a rimmed baking sheet, shaking vigorously as you go to get rid if excess coating. Transfer to refrigerator and let rest, uncovered, for at least 30 minutes and up to overnight.