Salt and freshly ground Pepper Position racks in upper and lower third of oven and preheat to 500F.
Lightly grease 2 baking sheets. Arrange potato slices in single layer on prepared baking sheets.
Brush generously with butter. Bake 7 minutes. Switch pan positions and continue baking until potatoes are crisp and browned around edges, about 7 to 9 minutes.
Transfer to heated platter. Sprinkle with salt and freshly ground pepper. Serve immediately.