COOK pasta as directed on package. Meanwhile, heat oil in large skillet on medium heat. Add onions; cook and stir 3 min. Stir in shrimp; cook and stir 5 min. or until shrimp turn pink.
ADD marinara sauce; cook 2 min. or until heated through, stirring frequently. Stir in cream cheese; cook 2 min. or until cream cheese is melted, stirring occasionally.
DRAIN pasta; place on serving plate. Top with shrimp mixture, shredded cheese and parsley.