Preheat oven to 350°F/176°C.
Slice potatoes thinly using a mandoline (about ⅙” thick).
Toss the sliced potatoes with heavy cream to prevent oxidation.
Grease an 8”x8” baking dish with butter, line the bottom with parchment cut to size and grease with butter again.
Shingle the potatoes in the pan, about 18-20 slices per layer. Brush each layer with melted butter and season with salt & pepper.
Repeat layering until all potatoes are used.
Cover the pan with foil and bake for 80-90 minutes. Test for doneness using a cake tester, it should be tender with a slight bite.
After baking, remove foil & place another piece of parchment on top. Place another 8"x8" pan on top and weigh it down with cans or something heavy to press potatoes together.
Cool for 30 minutes, then refrigerate for at least 2 hours or overnight.
Cut into 1" strips, then into 1 ½-2” pieces.
Heat olive oil in a pan over medium heat. Fry pave pieces for 4 min per side until golden and crispy