Heat oven to 375°F and spray on the interior of an 8x11" baking-dish with cooking-spray.
When the breasts are irregular thickness, then pound them (put in a Ziploc bag and onto a level surface) into a even ¾-1" thickness using a meat-pounder.
Sprinkle the breasts (either side ) with grated parmesan-cheese & freshly-ground black-pepper, and set them in the prepared baking-dish.
Whisk together sour cream and caesar dressing in a small-bowl. Pour on the sour cream/caesar mix over every breasts then sprinkle grated parmesan cheese on the top.
Put the prepared chicken in the oven and bake at 375°F for 30minutes.
Turn the oven to broil and broil the breasts an extra 2-4minutes or till the chicken turns golden-brown. It may burn fast, so watch it carefully.
When completed, remove from the oven and cover loosely with foil and permit chicken to rest 5-10minutes before serving.
Serve and enjoy. If desired, garnish with chopped parsley.