01 - Preheat oven to 375°F (190°C).
02 - Pat chicken breasts dry with paper towels and arrange in a greased 9x13-inch baking dish.
03 - In a medium mixing bowl, blend Caesar dressing, sour cream, garlic powder, salt, and black pepper until smooth.
04 - Spread the sauce evenly over the chicken breasts to fully coat.
05 - Evenly sprinkle grated parmesan cheese over the sauced chicken.
06 - Bake uncovered for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F (74°C).
07 - Remove chicken from the oven and allow to rest for 5 minutes. Garnish with chopped fresh parsley if desired.
08 - Serve hot, accompanied by desired side dishes.