Cook potatoes in boiling water to cover in a Dutch oven over medium heat 15 to 18 minutes or until tender. Drain and let cool slightly.
Place potatoes in a large bowl. Add bacon, chopped green onions, and next 4 ingredients. Stir together mayonnaise and sour cream until blended. Pour over potato mixture, tossing gently to coat. Cover and chill at least 1 hour. Garnish, if desired.