Wash and peel potatoes
Use mandolin to thinly slice potatoes into approximately 1mm thin slices
Place sliced potatoes into bowl
Add 2 pinches Sea Salt
Add cream to bowl and gently mix through sliced potatoes
Place potatoes flat, overlapped and evenly in lightly greased (with unsalted butter) baking dish, stopping every now and then to add another pinch of salt, until all potatoes are in place
Pour remainder of cream from mixing bowl over the top of the potatoes until just over half way up the baking dish, don't overfill to avoid the potatoes becoming too creamy
Add another pinch of salt across the top
Add freshly grated cheeses over the top, covering evenly
Place baking dish in preheated oven at 180°C and cook for 40 to 50 minutes until golden brown, use a paring knife to test if the potatoes are super tender
Serve hot and enjoy!