In a large bowl, combine chicken, buttermilk, salt, and pepper.
Refrigerate 3 hours or overnight.
Prepare breading stations: flour mixture (flour, cornstarch, salt, garlic powder), egg mixture (eggs, water), and panko-parmesan mixture.
Remove chicken from marinade.
Coat in flour mixture, dip in egg mixture, then press into panko-parmesan mixture.
Heat 2 inches of oil in a pot to 350°F.
Fry chicken in batches 4–5 minutes until golden and 165°F inside. Drain on paper towels.
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