Tip : I used a 7" cast iron skillet which holds an ample amount for 4. If you don't have a mandolin, just use a box grater with the slotted side.
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Pe heat oven to 400°
Spray a cast iron skillet with vegetable spray
Slice 2-3 white potatoes with a mandolin, no need to peel
Layer sliced potatoes in a concentric circle, season each layer, a lightly brush each layer with melted butter
When all the layers have been completed, move to a medium high heat and cook for 5-6 minutes
Cover the pan with aluminum foil and place in a pre heated oven for 15 minutes, then uncover, and bake for a further 20-25 minutes