Mashed-Potato Casserole with Sage and Fontina


To take mashed potatoes up a few notches, cookbook author Melissa Clark mashes them with a creamy, tangy mix of crème fraîche, butter, parsley and sage, then tops them with cheesy breadcrumbs and bakes until crisp. Slideshow: More Casserole Recipes 

Mashed-Potato Casserole with Sage and Fontina
Photo: © John Kernick
Active Time:
20 mins
Total Time:
1 hr
8 to 10


  • 6 tablespoons unsalted butter (plus more for greasing at room temperature)

  • 3 pounds baking potatoes (peeled and cut into 2-inch pieces)

  • ½ cup crème fraîche (4 ounces)

  • 2 tablespoons parsley (chopped)

  • 1 tablespoon sage (plus 2 sage leaves chopped)

  • 8 ounces imported Fontina cheese (shredded)

  • Kosher salt

  • Pepper

  • cup breadcrumbs (plain dry)

  • cup Parmigiano-Reggiano cheese (freshly grated)

  • Olive oil (for frying)


  1. Preheat the oven to 400°. Lightly grease a 2-quart shallow baking dish. In a large saucepan, combine the potatoes with enough water to cover by 2 inches. Bring to a boil and cook until fork-tender, 15 to 20 minutes. Drain well and transfer to a large bowl. Mash the potatoes with 4 tablespoons of the butter, the crème fraîche, parsley and chopped sage. Fold in the Fontina and season with salt and pepper. Spread the potato mixture in the prepared dish in an even layer.

  2. In a small bowl, using your fingers, blend the remaining 2 tablespoons of butter with the breadcrumbs and Parmesan until coarse crumbs form. Top the potatoes with the breadcrumb mixture. Bake for about 30 minutes, until golden and crisp on top.

  3. Meanwhile, in a small skillet, heat 1/4 inch of olive oil over low heat. Add the sage leaves and cook, stirring occasionally, until crisp, about 3 minutes. Transfer the sage to paper towels to drain. Scatter the fried sage over the casserole and serve.

Make Ahead

The assembled unbaked casserole can be refrigerated overnight.

Related Articles