1 tablespoon chopped fresh chives plus more for garnish
Directions
Preheat oven to 375°. Pierce potatoes with a fork; bake on oven rack until tender, 1 1/2 hours. Cool 10 minutes. Potatoes can also be cooked in a microwave on High for 9 minutes, and finished off in a 375° oven for about 20 minutes.
Halve potatoes lengthwise, leaving a thin shell; scoop flesh into a medium bowl. Add milk, butter, sour cream, and 1/4 cup cheese. Season with salt and pepper; fold in chives to combine.
Scoop filling into potatoes, and place in a baking dish just large enough to hold them. Sprinkle with remaining 1/4 cup cheese. Bake until heated through, 15 to 20 minutes.