To a large mixing bowl, add 1/2 cup ranch dressing, 1/4 cup olive oil, 2 tablespoons Worcestershire sauce, 2 tablespoons lemon juice,2 teaspoons white vinegar, 2 teaspoons salt, 1/2 teaspoon black pepper, and 1/2 teaspoon garlic powder, then mix well. Add 4 boneless skinless chicken breastsand marinate in the fridge for at least 1 hour or overnight.
Place a large skillet over medium to medium-high heat and pour in 4 tablespoons vegetable oil. Once hot, add the chicken so they aren't touching and cook until cooked through to 165F and seared on the outside.* Reduce the heat as needed so the marinade left on the chicken doesn't burn.
Place an oven rack one position above the middle spot and preheat to broil on high. Once the chicken is cooked, arrange the breasts on a baking sheet and set aside.
Place a small saucepan over low heat. Add 3/4 cup Parmesan cheese, 1/2 cup provolone cheese, and 1/3 cup ranch dressing and cook until the cheese has melted and the sauce is thick and smooth. Spoon over the chicken breasts, spreading it to cover the tops.
In a small mixing bowl, stir together 3/4 cup panko breadcrumbs, 4 tablespoons unsalted butter, and 2 teaspoons garlic powder. Divide the breadcrumb mixture evenly among the chicken breasts, spooning it over the cheese sauce.
Broil just until the breadcrumbs are golden brown. Remove from the oven, sprinkle with chopped parsley, and serve warm with your favorite sides.
Notes
*If needed, sear the chicken in two batches to prevent crowding the pan so they get a good sear. Use 2 tablespoons of oil per batch.Grill Variation: Grill the marinated chicken. Then transfer it to a baking sheet, add the toppings, and finish under the broiler.