Preheat oven to 400°F (200°C).

Butter a 9 x 13 inch baking dish with 2 inch high sides.

Stir whipping cream and Boursin cheese in a heavy large saucepan over medium heat until cheese melts and mixture is smooth.

Arrange 1/2 of sliced potatoes in the baking dish in slightly overlapping rows.

Season potatoes in dish generously with salt and pepper.

Pour 1/2 of the cheese mixture over the potatoes.

Arrange the remaining potatoes in slightly overlapping rows atop the potatoes in the dish.

Season with salt and pepper generously.

Pour the remaining cheese mixture over the potatoes.

Bake until the top is golden brown and potatoes are tender when pierced with a knife, about 1 hour.

Sprinkle with chopped fresh parsley and serve.