Pat the chicken dry with paper towels.
Set out three shallow plates. To the first plate, add the flour, garlic powder, salt, and pepper. Stir to combine.
To the second plate, add the beaten egg.
To the third plate, add the panko and parmesan. Stir to combine.
Dredge the chicken first into the flour mixture. Tap off excess flour and then dredge them into the egg mixture. Finally, dip the chicken into into the panko mixture and press to coat all sides evenly. Set on a plate and repeat with the remaining chicken.
To a large skillet on medium heat, add oil and heat to 375°F. Carefully lower a chicken cutlets into the oil, being careful not to overcrowd the pan. Depending on the size of your skillet, you may have to work in batches. Cook for 8-10 minutes, flipping halfway through, or until golden brown and the chicken reaches an internal temperature of 165°F.
Garnish with parsley and serve.