01 - Preheat the oven to 400°F. Lightly grease a 9x13-inch baking dish with cooking spray or a thin layer of oil.
02 - Pat chicken breasts dry with paper towels. Season both sides generously with salt and pepper. Arrange chicken in a single layer in the prepared baking dish, ensuring pieces do not overlap.
03 - In a medium bowl, combine Caesar dressing, sour cream, 1/3 cup Parmesan cheese, and garlic powder. Whisk until smooth and fully incorporated.
04 - Spread the Caesar sauce mixture evenly over each chicken breast, covering the top surface completely.
05 - Sprinkle shredded mozzarella cheese and 1/4 cup Parmesan cheese evenly over the sauced chicken. If desired, add dried Italian herbs for additional flavor.
06 - Bake for 25-30 minutes until chicken reaches an internal temperature of 165°F and the cheese topping is golden brown and bubbly. Avoid overbaking to prevent dry chicken.
07 - Remove from oven and let chicken rest for 5 minutes to allow juices to redistribute. Garnish with fresh chopped parsley if desired, then serve warm.