COOK pasta in unsalted boiling water in large saucepan 10 min. or just until tender, adding peas for the last 3 min.
MEANWHILE, beat cream cheese spread, dressing and flour in medium saucepan with whisk until well blended. Gradually stir in milk. Add ham; cook on medium-low heat 5 min. or until heated through, stirring occasionally.
DRAIN pasta mixture; return to saucepan. Add cream cheese sauce; mix lightly. Cook 2 to 3 min. or until heated through, stirring occasionally. Top with parsley and Parmesan.