INGREDIENTS
1 refrigerated pie crust (half of 15-ounce package)
2 tablespoons (1/4 stick) butter
2/3 cup chopped shallots (about 3 medium)
5 cups sliced assorted mushrooms (such as chanterelle, stemmed shiitake, oyster, crimini, and button; 12 to 14 ounces), large mushrooms halved
4 large eggs
2/3 cup half and half
1/3 cup whole milk
1/2 teaspoon salt
1/2 teaspoon freshly ground black pepper
1/2 teaspoon freshly grated or ground nutmeg
1 1/2 cups (packed) coarsely grated Fontina cheese (about 7 ounces), divided