Heat oven to 300 degrees. Place pork ribs in baking dish. Stir together 1/2 cup sauce, garlic powder, pepper and salt. Pour chipotle sauce mixture over ribs in baking dish; toss until coated. Place ribs, in a single layer, on a large piece of heavy-duty foil. Bring up long sides of roil; seal close with double fold. Seal close remaining short sides of foil with double fold to form a foil packet.

Place foil packet, seam side up, in jelly-roll pan or on baking sheet in oven. Bake for 2 to 2 1/2 hours or until meat is very tender. Remove from oven.

Heat oven broiler. If juices have leaked onto jelly-roll pan or baking sheet, wipe dry with paper towels. Open foil packet. Generously brush ribs with some remaining chipotle sauce. Broil 4 inches from heat for 3 minutes. Turn ribs over; generously brush with additional chipotle sauce. Continue broiling for 3 minutes more. Serves 3.