01 - Set oven temperature to 375°F (190°C) and allow to fully preheat.
02 - Dry chicken breasts using paper towels and arrange in a greased 9x13-inch baking dish.
03 - Combine the Caesar dressing, sour cream, garlic powder, salt, and black pepper in a medium bowl. Stir until mixture is completely smooth.
04 - Distribute the sauce mixture evenly over each chicken breast, ensuring full coverage.
05 - Sprinkle grated parmesan cheese evenly over the sauced chicken breasts.
06 - Transfer dish to the preheated oven and bake uncovered for 25 to 30 minutes, or until the internal temperature of the chicken reaches 165°F (74°C).
07 - Remove the dish from the oven and let chicken rest for 5 minutes. Sprinkle with chopped fresh parsley, if desired.
08 - Serve hot alongside preferred accompaniments.