For best results, use a mandoline to ensure uniform potato slices, which helps them cook evenly.
If you prefer a crispier top, uncover the dish for the last 10-15 minutes of baking.
This dish can be prepared ahead of time and refrigerated before baking; add 10-15 minutes to the cooking time if baking from cold.
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave.