01 - Set oven to 375°F. Allow to preheat fully before cooking.
02 - Pat chicken breasts thoroughly dry using paper towels and arrange in a lightly greased 9x13-inch baking dish.
03 - Whisk together Caesar dressing, sour cream, garlic powder, salt, and black pepper in a medium mixing bowl until homogeneous.
04 - Spread the prepared sauce evenly over each chicken breast, ensuring complete coverage.
05 - Distribute grated parmesan evenly over the sauced chicken breasts.
06 - Transfer dish to oven and bake uncovered for 25 to 30 minutes or until an instant-read thermometer registers 165°F at the thickest portion of the chicken.
07 - Remove dish from oven and allow chicken to rest for 5 minutes. Sprinkle with freshly chopped parsley before serving, if desired.
08 - Portion hot chicken and plate with preferred accompaniments.