Heat grill to medium heat.

Cut potatoes in half lengthwise and spoon out the flesh, leaving half-inch shells. Mix garlic and melted butter. Brush potatoes on both sides with garlic butter mixture.

Grill franks 7 to 9 minutes, or until heated through, turning occasionally; slice into rounds. Grill potatoes until crisp, about 4 to 4 1/2 minutes on each side.

Spoon sliced franks into the potato shells; drizzle with barbecue sauce and top with cheese. Grill until the cheese is melted. Top with sour cream and chives.

Alternative Cooking Method: If you prefer, bake the buttered potato skins in a 250°F oven until crisp, about 15 minutes, before adding the toppings. Fill as directed and bake 5 minutes more.