1 Prepare pasta according to package directions; Prepare pasta according to package directions; 2 . In a large saucepan, bring the evaporated milk to a simmer over moderate heat. 3 Stir in the Parmesan cheese, green onions and parsley. 4 As soon as it has melted, and the sauce is thick and creamy, pour over cooked pasta. 5 Season to taste with white pepper.