In a bowl, combine all marinade ingredients. Pour marinade over chicken breasts and refrigerate for 2-3 hours, or overnight for best flavor.
When ready to cook, preheat grill to medium-high heat. Grill marinated chicken for 12-15 minutes, until fully cooked and internal temperature reaches 165°F.
While the chicken is grilling, mix ¼ cup Parmesan with ¼ cup ranch dressing to make the ranch spread. Set aside.
In a small bowl, combine panko, garlic salt, Parmesan, and melted butter to create the Parmesan crumb topping.
Once chicken is cooked, preheat broiler. Place chicken in an oven-safe dish, then spread each with 2 tbsp of ranch spread, followed by shredded provolone, and Parmesan crumb topping.
Broil until cheese melts and topping turns light golden brown. Watch closely to prevent burning. Serve hot with your favorite sides.