1. Cook the potatoes in water for 20 minutes, then peel and slice them.
2. Slice the onions and sauté them in a little butter.
3. Add the smoked bacon and let it cook over low heat for about ten minutes, stirring regularly.
4. Prepare a baking dish (I use a round terracotta dish, 40 cm in diameter, 10 cm high). Generously rub the bottom of the dish with a clove of garlic.
5. Arrange the dish in three layers: cover the bottom of the dish with half of the potatoes, then add the onion and bacon mixture, and finally add the remaining potatoes on top.
6. Pour the white wine and the heavy cream over it. Season with plenty of pepper and a little salt.
7. Preheat the oven to 190°C (375°F).
8. Scrape the reblochon cheese, cut it in half horizontally, and place it (crust side up) on top of the potatoes.
9. Bake for about 20 minutes (I use the "convection" + broil setting).
10. When serving (in the baking dish), you can sprinkle a little chopped parsley on top.
11. This hearty dish is best enjoyed with the wine used in the recipe.