Fill a large pot with enough water to cover your potatoes on medium high heat and cook, with a lid ajar, until they are easily pierced with a knife, approximately 15 minutes.
Remove and drain, setting aside to cool until the potatoes are cool enough to handle and cut into cubes. Set aside.
Preheat your oven to 180C/350F.
Meanwhile, place a heavy frying pan on medium low heat with a drizzle of olive oil.
Toss the bacon into the pan and cook until golden, approximately 5 minutes.
Add the onions, stirring until browned, approximately 2 minutes.
Pour in the wine and return the bacon to the pan, simmering until the wine has evaporated, approximately 5 minutes.
Remove from the heat and stir in the cubed potatoes.
Spoon half the potatoes into your baking dish, spreading out evenly.
Lay half the sliced reblochon cheese on top.
Repeat with the remaining potatoes and cheese.
Place in the oven and bake until golden, approximately 20 minutes.
Remove and serve up immediately.
Enjoy!