01 - Preheat the oven to 400°F. Lightly grease a 9x13-inch baking dish with cooking spray or a small amount of oil.
02 - Pat chicken breasts dry with paper towels. Season both sides generously with salt and black pepper. Arrange seasoned chicken in a single layer in the prepared baking dish.
03 - In a medium bowl, combine Caesar dressing, sour cream, 1/3 cup grated Parmesan cheese, and garlic powder. Whisk until smooth and fully incorporated.
04 - Spread the prepared sauce mixture evenly over each chicken breast, ensuring complete coverage.
05 - Sprinkle shredded mozzarella cheese and remaining 1/4 cup Parmesan cheese evenly over the sauced chicken. If desired, add dried Italian herbs for additional flavor.
06 - Bake for 25 to 30 minutes, or until chicken reaches an internal temperature of 165°F and cheese topping is golden brown and bubbly.
07 - Remove from oven and let chicken rest for 5 minutes to allow juices to redistribute. Garnish with fresh chopped parsley before serving if desired.