Set potatoes in a casserole. Cover with cold water. Salt and bring to a boil. Cover and cook for 20 to 25 minutes at low heat until potatoes are cooked al dente. Drain and cool down.
Melt butter in a pan over medium heat. Fry onion or sliced leeks with bacon for 2 to 3 minutes. Season.
Finely slice potatoes.
Butter a square baking plate of 20 cm (8 inches) and at least 6.5 cm (2 1/2 inches) deep. Spread about a third of the potato slices on the plate, then cover with onions or sliced leeks and bacon. Repeat this step once again. Cover with a last layer of potatoes. Pour cream. Cover with cheese, then pour white wine.
Oven bake for 20 to 25 minutes, until potatoes are cooked.
Did you know that...
1 package of sliced leeks contains the equivalent of 2 whole leeks.