Pound chicken breasts to ½ inch thick.
Marinate the chicken in Italian dressing for at least 30 minutes, or overnight, in a bowl covered with plastic wrap or a gallon freezer bag.
When ready to cook, place olive oil in a cast iron skillet. Heat to medium high heat. Using tongs, add the marinated chicken and sear for 5 minutes per side (or untilcooked through). You don’t want to just pour all of the marinade into the castiron skittle or you will have TOO much liquid, just use tongs to take the chicken breasts out of the marinade and place in the skillet
Stir together ¼ cup of the parmesan cheese and all of the ranch dressing. Spoon and smooth this over the chicken breasts. Place 1 slice of provolone cheese on top of each chicken breast.
Place the skillet with chicken in it directly into the oven and allow itto broil on low for 3-5 minutes. Watch closely as some broilers work very quickly.
While this is broiling, combine the melted butter, panko crumbs, garlic powder, salt and pepper, and the remaining ¼ cup of parmesan cheese.
Carefully remove the pan from the oven (remember the pan will be extremly hot), and crumble bread crumb mixture over the chicken. Return it to the oven and continue to broil until it's golden brown. Remove and serve.