Stuff potato shells as directed, but do not top with remaining cheddar. Refrigerate up to 24 hours. Heat oven to 325ºF. Bake potatoes, uncovered, 45 min. Top with remaining cheddar; bake 5 min. or until melted. Sprinkle with bacon.
Substitute 4 slices ready-to-serve bacon, chopped, for the crumbled cooked bacon.