Can I use a different type of cheese?
Yes. Monterey Jack, Gruyère, or mozzarella work well; cheddar is traditional for sharp flavor and good melting.
How do I know when it's done cooking?
Cook until the top is golden and the cheese is fully melted and bubbly, about 5–7 minutes depending on your heat.
Can I make this ahead?
Prepare up to the point of cooking, cover, and refrigerate up to 4 hours; add 2–3 minutes to cooking time when cold.
What pan should I use?
A small nonstick skillet or cast-iron pan works best; avoid stainless steel without adequate oil, as it may stick.
Can I use frozen potatoes instead?
Frozen mashed potatoes are less ideal due to water content, but thawed and drained potatoes can work in a pinch.