Bake potatoes at 400° for 1 hour or until tender. Cool slightly. Reduce heat to 350°.

Cut each potato in half lengthwise. Scoop out pulp, leaving a thin shell. In a large bowl, mash the pulp with butter. Stir in the sour cream, cheese, bacon and onions. Spoon or pipe into potato shells.

Place on a baking sheet. Bake for 30-35 minutes or until heated through.