Place the diced potatoes in a steamer basket over a large pot of boiling water. Cover, and steam for about 15 minutes, or until potatoes are fork tender.
Transfer the potatoes to a large bowl. Roughly mash the potatoes using a potato masher, or press them through a ricer if you have one.
Add the broth, Greek yogurt, and chives.
Season with salt and pepper to taste, sprinkle with Parmesan, and serve.
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