- 1 1/4 pounds Yukon Gold potatoes (3 to 4 medium), peeled
- 1 1/4 pounds sweet potatoes (2 medium), peeled
- 6 tablespoons unsalted butter, melted
- Coarse salt and freshly ground pepper
- Preheat oven to 425 degrees. Cut Yukon Gold and sweet potatoes into 1/8-inch-thick slices with a handheld slicer or sharp knife, keeping potato varieties separate.
- Brush an ovenproof 10-inch nonstick skillet with butter. Starting in center of pan, arrange about 20 Yukon Gold slices, slightly overlapping, in a circular pattern, covering surface. Brush with butter and generously season with salt and pepper. Make another layer with sweet-potato slices; brush with butter and season. Repeat, alternating Yukon Gold and sweet-potato slices. Drizzle any remaining butter on top of potatoes.
- Place skillet over medium-high heat and cook until butter vigorously bubbles in pan, about 4 minutes. Transfer to oven and bake 30 minutes. Tent loosely with foil and continue to bake until potatoes are easily pierced with a knife, about 20 minutes more. Remove from oven. Run a small rubber spatula around edges of potatoes to loosen. Carefully invert onto a plate and cut into wedges.
The Japanese Benriner mandoline slicer (jbprince.com) makes quick work of cutting potatoes and other vegetables into thin, even slices. It’s less intimidating and easier to clean and store than a traditional metal mandoline.