Add flour, cornstarch, salt, ginger, garlic powder to a large freezer bag (or large bowl). Add eggs to a separate large freezer bag (or bowl). Add chicken to flour mixture, toss until well coated. Remove chicken, letting excess flour drip off, and add to egg bag and massage until evenly coated. Remove chicken, letting excess egg drip off and return to flour bag. Shake once more until evenly coated.