- 3 pounds large Yukon Gold potatoes
- 1/2 stick unsalted butter, melted
- 3 tablespoons olive oil
- Equipment: an adjustable-blade slicer
- Preheat oven to 350°F with rack in upper third. Butter a 3-to 4-quart shallow baking dish.
- Peel potatoes and thinly slice (about 1/16 inch thick) with slicer. Toss with butter, oil, 1 teaspoon salt, and 1/2 teaspoon pepper in a large bowl. Transfer to dish and cover tightly with foil.
- Bake 20 minutes. Remove foil and increase oven temperature to 450°F, then continue to bake until top is browned and crisp, about 25 minutes more.