Bring first 3 ingredients and 2 cups water to a boil in a large saucepan over medium-high heat, and cook 20 minutes or until tender. Drain and let cool 30 minutes.
Whisk together yogurt and next 6 ingredients in a large bowl until combined.
Gently fold potatoes into yogurt mixture. Cover and chill 1 to 12 hours. Garnish, if desired.
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