Instructions

  1. Prepare rigatoni acoording to package directions.
  2. Meanwhile, spread oil on bottom of an 11x7" baking dish; add onion in a single layer. Bake at 375 degrees for 15 minutes or just until tender. Transfer onion to a large bowl and set aside.
  3. Drain thawed spinach well, pressing between layers of paper towls.
  4. Stir rigatoni, spinach, chicken and next 4 ingredients into onion in bowl. Spoon mixture into baking dish, and sprinkle evenly with shredded mozzarela cheese.
  5. Bake, covered, at 375 degrees for 30 minutes; uncover and bake 15 more minutes or until bubbly.