Heat oven to 375, cook pasta, adding spinach to boiling water for last 1 minute.
Cook and stir chicken and basil in large nonstick skillet on medium-high heat until chicken is cooked. Add sauce and diced tomatoes(drained); bring to boil and stir in the cream cheese. Simmer 3 minutes ( I did mine abit longer just to make sure the chicken was cooked and all the flavors mixed well).
Drain pasta mixture; stir in chicken mixture and 1/2 cup mozzarella.
Bake for 20 minutes, sprinkle with remaining cheeses - mozzarella and parmesan and bake for 3 minutes.