Mashed Potato Casserole With Sage and Fontina
Serves 8 to 10.
Note: This is perfect to make ahead, as the assembled unbaked casserole can be refrigerated overnight, then baked just before serving. Fontina is a good melting cheese; substitutes include Gruyère, provolone or Gouda. From "Potluck: Food and Drinks to Share With Friends and Family," by the editors of Food and Wine magazine.
• 6 tbsp. unsalted butter, at room temperature, divided, plus more for greasing
• 3 lb. baking potatoes, peeled and cut into 2-in. pieces
• 1/2 c. crème fraîche (4 oz.)
• 2 tbsp. chopped parsley
• 1 tbsp. chopped fresh sage, plus 12 sage leaves
• 8 oz. fontina cheese, shredded (see Note)