01 - Preheat oven to 375°F (190°C).
02 - Pat chicken breasts dry using paper towels and arrange in a greased 9x13-inch baking dish.
03 - Combine Caesar dressing, sour cream, garlic powder, salt, and pepper in a medium bowl. Mix until smooth and well blended.
04 - Evenly coat the chicken breasts with the prepared sauce.
05 - Distribute grated parmesan cheese over the sauce-covered chicken.
06 - Place dish in the oven and bake uncovered for 25 to 30 minutes, or until chicken reaches an internal temperature of 165°F (74°C).
07 - Allow chicken to rest outside the oven for 5 minutes. Garnish with chopped fresh parsley if desired.
08 - Serve hot with preferred accompaniments.