Bring a large saucepan or pot of water to boiling; add cubed turnips. Return to boiling; reduce heat. Simmer, covered, about 25 minutes or until turnips are very tender. Drain well; return to the hot saucepan.
Using a potato masher, mash turnips until nearly smooth. Add cream cheese; mash until combined.
Stir in garlic powder, pepper, and kosher salt. Serve warm. Top with chives.