Preheat oven to 375 degrees F. Grease a 9x13 inch baking dish and set aside.
Pat chicken dry and place in prepared pan.
Place a slice of Swiss cheese on top of each chicken breast.
In a bowl mix mayonnaise, sour cream, ½ cup Parmesan cheese, garlic powder, salt and pepper. Spread mixture over chicken and sprinkle with remaining ¼ cup Parmesan.
Bake for 1 hour, until the internal temperature of chicken reaches 164 degrees F. Serve chicken on it's own or over rice if desired.
Video
Notes
A Lighter Option. To cut back on calories, you can use light dairy products (light Swiss cheese, ligh mayo, light sour cream). The flavor is still delicious!