Slice potatoes with the mandoline slicer with ⅛ inch thickness.
In a small saucepan, add the heavy cream, thyme leaves, grated garlic and nutmeg on medium heat until it simmers.
Add one even layer of potatoes on the baking dish, season the layer with salt, pepper and the 2 cheeses. Repeat 4-5 more times. Pour the cream mixture and add the remaining cheese.
Bake for 30-40 mins using the middle rack until you have tender potatoes (you can check this with a fork). Then turn on your broiler and broil for 5 minutes until the top layer becomes golden brown. Let it cool for 10 mins before serving.
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