1. Fold a 48x18-inch piece of heavy foil in half to make a 24x18-inch rectangle. Grease with 1 tablespoon of the butter.
2. Scrub and thinly slice unpeeled potatoes. Place potatoes in center of foil. Sprinkle with green onions, Parmesan cheese, salt, paprika, and pepper. Dot with the remaining butter.
3. Bring up 2 opposite edges of foil and seal with a double fold. Fold remaining ends to completely enclose potatoes, leaving space for steam to build.
4. In a charcoal grill, grill potato packet on the rack of an uncovered grill directly over medium coals for 30 to 40 minutes or until potatoes are tender, turning packet every 10 minutes during grilling. (In a gas grill, preheat grill. Reduce heat to medium. Place potato packet on grill rack over heat. Cover and grill as above.) Before serving, sprinkle potatoes with bacon, parsley, dill, and chives. Makes 4 servings.