If you make this you are in for a treat!
I first came across this recipe when I was 11 😅 during the weekly cooking class in high school. There was a dairy cookbook for sale and it was my first cookbook I ever owned. It had a huge number of recipes, mainly French in nature and over the years I made several dishes with Pan Haggerty and creme brûlée being the ones I still make to this day. The book is now certainly worse for wear but still remains in my collection of books.
This is a very modest dish, a layered concoction of meltingly soft potatoes and onions, with umami cheesy flavour coming from the cheese.
The browned top and caramelised potatoes on the bottom of the pan are the best parts of this dish and often fought over 😂

I like to serve this with baked beans, comfort food at its best!
It’s remained a firm family fave over the years. Do give it a go!