Scrub potatoes and cut off the ends. Thinly slice them in a food processor or by hand if you don't have one. The thinner the better.
Mix together Boursin cheese and heavy whipping cream until evenly combined.
Spread a layer of potatoes in 9x13 baking dish. Salt lightly. Pour some of the cream/cheese mixture over the potatoes. Compress by mashing with hand. This helps the cream/cheese mixture get in all the cracks and spaces of the potatoes. Sprinkle lightly with parmesan cheese.
Continue this layering process with the salt, cream/cheese mixture and parmesan cheese- mashing between each layer. I typically get about three different layers.
Bake at 350 degrees F until done. (about 1 hour to 1 hour and 20 minutes.)
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