Cook spaghetti as directed on package, adding stir-fry vegetables to the cooking water for the last 3 min. of the spaghetti cooking time.
Meanwhile, heat oil in large nonstick skillet on medium-high heat. Add chicken; cook 6 min., stirring occasionally. Stir in tomatoes and dressing; bring to boil. Reduce heat to medium; simmer 4 min., stirring occasionally. Add cream cheese spread; cook and stir until cream cheese is completely melted and mixture is well blended.
Drain spaghetti mixture; place in large bowl. Add chicken mixture; toss to coat. Sprinkle with Parmesan cheese.