Step by Step Prep: Boil 2 quarts water in large pot. Stir in pasta. Reduce heat to medium-high (to minimize foaming). Cook 7-8 minutes, stirring occasionally. For more tender pasta, boil an additional minute. Drain; do not rinse. Return pasta to pot. Stir in 2 tablespoons unsalted butter, 1/4 cup milk, and sauce mix until blended. Let stand 2 minutes before serving.