01 - Preheat the oven to 400°F. Lightly grease a 9x13-inch baking dish with cooking spray or butter.
02 - Pat chicken breasts dry with paper towels and season both sides generously with salt and pepper. Arrange them in a single layer in the prepared baking dish.
03 - In a medium bowl, whisk together Caesar dressing, sour cream, 1/3 cup Parmesan cheese, and garlic powder until smooth and well combined.
04 - Spread the sauce mixture evenly over each chicken breast, ensuring complete coverage.
05 - Sprinkle mozzarella cheese and 1/4 cup Parmesan cheese evenly over the sauced chicken. Add Italian herbs if using for additional flavor.
06 - Bake for 25 to 30 minutes until chicken reaches an internal temperature of 165°F and the cheese topping is golden and bubbly.
07 - Let the chicken rest for 5 minutes before serving to allow juices to redistribute. Garnish with fresh chopped parsley if desired.