01 - Preheat the oven to 375°F. Lightly grease a 9x13-inch baking dish with cooking spray or a thin layer of oil.
02 - Pat the chicken breasts dry with paper towels to remove excess moisture, then arrange them in a single layer in the prepared baking dish.
03 - In a medium bowl, whisk together the mayonnaise, grated parmesan cheese, garlic powder, onion powder, black pepper, salt, and Italian herbs (if using) until smooth and well combined.
04 - Spread the creamy mixture evenly over the top of each chicken breast, ensuring the meat is completely covered with the coating.
05 - Bake for 25–30 minutes, or until the chicken is cooked through (internal temperature reaches 165°F) and the topping is golden brown and bubbly.
06 - For a darker, crispier topping, switch the oven to broil and cook for an additional 2–3 minutes, watching closely to prevent burning.
07 - Remove from the oven and let the chicken rest for 5 minutes to allow juices to redistribute. Sprinkle with freshly chopped parsley before serving.