Tartiflette (French Cheese and Potato Casserole)

Place potatoes into a large pot and cover with salted water; bring to a boil. Reduce heat to medium-low and simmer until tender, about 20 minutes. Drain and cool until easily handled. Peel and slice potatoes.

Heat oil in a large skillet over medium heat and cook onions until soft and translucent, about 5 minutes. Add potatoes and bacon, cover, and simmer over medium-low heat for 15 minutes. Add wine, salt, and pepper.

Preheat oven to 425 degrees F (220 degrees C). Grease a baking dish.

Transfer potato mixture to the prepared baking dish and cover with Reblochon cheese.

Bake in the preheated oven until cheese is melted and slightly browned, about 30 minutes.