01 - Preheat oven to 375°F (190°C).
02 - Pat chicken breasts dry with paper towels and arrange evenly in a greased 9x13-inch baking dish.
03 - In a medium mixing bowl, whisk Caesar dressing, sour cream, garlic powder, salt, and pepper until fully integrated.
04 - Evenly spread the sauce mixture over the chicken breasts in the baking dish.
05 - Sprinkle grated parmesan cheese uniformly over the sauced chicken.
06 - Bake uncovered for 25 to 30 minutes, until chicken is cooked through and the internal temperature registers 165°F (74°C).
07 - Remove from oven and allow to rest for 5 minutes. Garnish with chopped parsley if desired.
08 - Serve hot alongside your preferred side dishes.