Rigatoni and Cheese

Name: Rigatoni and Cheese
Ingredients: 3 1/2 ounces diced bacon; 1 ounce diced shallots; 5 1/2 ounces diced porcini mushrooms; 6 ounces chicken stock; Salt and freshly ground black pepper; 3 ounces butter; 3 tablespoons bread crumbs, plus extra for sprinkling; 1 tablespoon chopped parsley leaves; 8 rigatoni shells; 1 tablespoon truffle shavings; Parmesan cheese, as needed; 2 cups milk, scalded; 2 to 3 teaspoons blonde roux, recipe follows; 4 ounces aged cheddar, grated; 2 tablespoons butter; 2 tablespoons all-purpose flour