Prepare as directed through Step 2. Place potatoes in a single layer in an airtight container. Cover and chill for up to 24 hours. Before serving, preheat oven to 325 degrees F. Place potatoes in a 2-quart square baking dish. Bake, covered, in the preheated oven for 30 minutes. Uncover and bake about 15 minutes more or until potatoes are golden brown and heated through.
Southwestern Twice Baked Potatoes:
Prepare as above, except in Step 2 substitute snipped fresh cilantro for the chives; substitute Monterey Jack cheese with jalapenos for the Gruyere. Serve with purchased salsa. Omit optional chive garnish.
Bacon-Cheddar Twice-Baked Potatoes:
Prepare as above, except in Step 2 stir in 1/3 cup cooked, crumbled bacon along with the sour cream; substitute cheddar cheese for the Gruyere cheese.