HEAT oven to 450ºF.
PLACE ovenproof Dutch oven or large deep skillet in oven 15 min. Meanwhile, mix sugar, garlic powder and pepper until blended. Sprinkle over meat; rub into meat.
REMOVE pan from oven. Add oil and meat to pan; return to oven. Bake 20 min. turning meat after 10 min.
ADD vegetables to pan. Mix broth and barbecue sauce; pour over meat and vegetables. Top with thyme; cover. Reduce oven temperature to 350ºF; bake 2-1/2 to 3 hours or until meat is tender.
TRANSFER meat and vegetables to platter, reserving drippings in pan. Discard thyme. Cook drippings on stove top on medium-high heat 5 min. or until reduced to about 2 cups. Cut meat across the grain into thin slices. Serve with vegetables and gravy.