Can I prepare twice-baked potatoes ahead of time?
Yes. Bake, fill, and chill up to 24 hours before the final broil. Add 5–10 minutes to broiling time if cooking straight from refrigerated.
What if I don't have Gruyère cheese?
Swiss, Emmental, or aged cheddar work well. Avoid soft cheeses; use firm varieties that melt and brown under the broiler.
How do I know the potatoes are fully baked on the first pass?
A fork should pierce the flesh easily. Bake 45–50 minutes at 400°F until the skin is just starting to crisp and the interior is tender.
Can I make the cream sauce thicker or thinner?
Simmer longer to thicken or whisk in more heavy cream gradually to thin. Sauce should coat a spoon lightly before final assembly.
How do I pipe the potato filling smoothly?
Use a pastry bag with a large open or star tip. Fill the bag halfway, twist the top, and pipe in even strokes from the center outward.