Preheat oven to 400F and grease a 9x13 inch baking dish.

Using a sharp knife or medallion slicer, cut the potatoes into 1/8 inch thick round pieces. Set aside

In a mixing bowl, whisk together cream, butter, rosemary and salt until well combined.

Create a flat layer on bottom of baking dish with 1/3 of the sliced potatoes. Pour 1/3 cream mixture on top of the layer of potatoes.

Repeat this process two more times (the sequence is potatoes, mixture, potatoes, mixture).

Loosely cover the baking dish with foil and bake in the oven for 30 minutes.

Remove foil and bake an additional 10 minutes. Let cool and enjoy!