Heat oven to 375º. Pierce potatoes with fork. Bake 1 to 1 1/4 hours until tender. Cool just until easy to handle. Cut potatoes lengthwise in half; scoop out inside, leaving a thin shell.
Mash potato and beans in medium bowl. Stir in 2 tablespoons of the sour cream, 2 tablespoons of the chives and remaining ingredients. Fill shells with potato mixture. Place in ungreased rectangular pan, 13x9x2 inches.
Bake uncovered 15 to 20 minutes or until hot and light brown. Top with remaining 2 tablespoons sour cream, chives and bacon bits.