In the 3-quart pot, cover the potatoes and garlic with water, add salt, and bring to a boil. Reduce heat to medium and cook until potatoes are fork tender, about 20 minutes. Drain.
Stir the butter into the drained potatoes, then add the yogurt and Parmesan cheese. Whip with the hand mixer, then stir in the thyme, parsley, and sage.
Spread in the prepared baking dish, then sprinkle on the paprika. Bake in the preheated oven until heated through, about 15 to 20 minutes.
Sprinkle the chopped chives over the potatoes and serve hot.