1 tablespoon butter, room temperature |
4 lbs russet potatoes, peeled and cut into 1-inch pieces |
1/2 cup butter, melted |
1 cup whole milk, room temperature |
1 1/2 cups mozzarella cheese, shredded |
3/4 cup freshly grated parmesan cheese |
8 ounces pancetta, diced, cooked and drained |
salt (to taste) |
fresh ground pepper (to taste) |
1/4 cup fresh flat-leaf italian parsley, chopped |
2 tablespoons plain breadcrumbs |
1/4 cup freshly grated parmesan cheese (topping) |