Season chicken strips generously with salt and pepper in a large bowl. Ensure the chicken is fully submerged in buttermilk. Cover and refrigerate for optimal flavor infusion, chilling for a minimum of 3 hours or up to 48 hours.
Before breading, allow the marinated chicken to reach room temperature. Line a large baking sheet with parchment paper for easy cleanup.
In a spacious mixing bowl, blend together flour, cornstarch, salt, and garlic powder to create the base coating.
In a separate medium-sized bowl, whisk together eggs and water until well combined.
For the final coating, in another large bowl, combine a portion of the flour mixture with panko breadcrumbs, tossing to evenly distribute.
To bread the chicken, start by dredging each piece in the flour mixture, then the egg mixture, and finally, the panko mixture. Place the coated chicken onto the prepared baking sheet.