Mashed pototates with Greek yogurt

I'm starting to use Greek yogurt instead of sour cream.  I recently found a link (yes, through Pinterest!) for Mashed Yukon Gold Potatoes with Greek Yogurt and Chives.  It makes a lot and we ate the leftovers all weekend long.  By Sunday, I was used to the Greek Yogurt and could taste the similarities between sour cream and Greek yogurt. 

3-4 lbs Yukon Gold potatoes
1 cup warmed milk
2 T butter
1/2 cup Greek Yogurt or light sour cream
4 T chopped fresh chives, divided
black pepper

Wash, (peel), and chop potatoes.  Bring a pot to a boil and cook until tender.  Drain.  Return to pot and mix in warm milk, butter, and season with salt and pepper.  Transfer mashed potatoes into a serving bowl, spooning the yogurt into the top layer.  Sprinkle chives on top with more black pepper.

Source: Natural Health.  "Mashed Yukon Gold Potatoes with Greek Yogurt and Chives."  2012.