Preheat your oven to 400°F. Pound each chicken thigh to 1/4-inch thickness.
Rub the chicken thighs with the garlic powder, smoked paprika, salt, and black pepper. Drizzle with the olive oil and let marinate for 15 minutes.
Line a baking sheet with parchment paper. In a large bowl whisk together the egg and milk.
Fill a shallow dish with flour. In another dish combine the panko breadcrumbs with the Parmesan. Coat the prepared chicken with the flour, then dip into the egg mixture then dredge it through the panko mixture. Press to coat well. In the world of cooking, "dress to impress" applies to your chicken too!
Spray the chicken with cooking oil spray.Place the chicken onto the sheet and bake in the oven for 10–15 minutes until golden brown. We want to tan the chicken, not give it a sunburn. This isn't Jersey Shore for the poultry world!
Serve the crispy baked chicken cutlets with lemon slices and sprinkle with fresh chopped parsley. Enjoy!