extra cheesiness, mix in 1/2 cup shredded mozzarella or mild cheddar with the Parmesan in the pour-over. If you need to prep ahead, assemble the dish up to the point of baking, cover, and refrigerate for up to 24 hours—add an extra 10–15 minutes to the covered baking time if it goes into the oven cold.
For a one-pan feel, tuck in a layer of thinly sliced ham or cooked crumbled bacon between the potatoes before you pour on the cream. To make it vegetarian and a bit more
