Ingredients
1/4 cup breadcrumbs
2 tablespoons unsalted butter, melted, divided
1 1/2 cups combined shredded Fontina, mozzarella and parmesan, divided
8 ounces chopped spaghetti
1 cup shredded mozzarella
1 large egg, beaten
1/4 cup whole milk
1 small bunch chives, chopped
4 ounces pancetta, diced and sautéed until crispy then cooled