Turkey Shepherds Pie with Sweet Potato

Name: Turkey Shepherd's Pie with Sweet Potato
Ingredients: 4 to 5 medium sweet potatoes, cooked; 1 cup heavy cream; 4 tablespoons unsalted butter, softened; 1 teaspoon ground coriander; 1 teaspoon ground ginger; 2 large egg yolks; Kosher salt and freshly ground black pepper; 1/4 cup grated Parmesan; 1/4 cup grated Pecorino-Romano; 1/4 cup breadcrumbs; 1 teaspoon fresh thyme leaves; 4 strips bacon or pancetta, diced; 2 pounds ground dark meat turkey; 1 Spanish onion, chopped; 1 leek, washed and small diced; 6 sage leaves, minced; 1/4 cup pine nuts; 1 1/2 tablespoons all-purpose flour; 1 tablespoon tomato paste; 1/2 teaspoon ground coriander; 1/2 teaspoon ground ginger; 2 cups chicken stock; 1 cup frozen diced carrots, thawed; 1/2 cup chopped fresh parsley