01 - Set oven temperature to 400°F (204°C). Lightly grease a baking dish suitable for four chicken breasts arranged in a single layer.
02 - Pat chicken breasts dry using paper towels and arrange them evenly in the prepared baking dish.
03 - In a mixing bowl, whisk together Caesar dressing, sour cream, 1/2 cup grated Parmesan cheese, garlic powder, and ground black pepper until fully blended.
04 - Evenly spread the Caesar sauce mixture over each chicken breast, ensuring thorough coverage.
05 - Sprinkle shredded mozzarella cheese and remaining 2 tablespoons grated Parmesan cheese on top of the sauced chicken.
06 - Bake for 25 to 30 minutes, or until the chicken is cooked through and the cheese topping is golden and bubbling. Chicken should reach an internal temperature of 165°F (74°C).
07 - Allow the chicken to rest for 5 minutes before garnishing with chopped fresh parsley and serving as desired.