Cook pasta as directed, drain. Spary a lg skillet w/ cooking spray. Place skillet over med-high heat. Brown ground turkey in skillet.
Add onions, salt and pepper. Cook until onion is softened. Stir in pasta sauce and heat through.
Add cooked pasta to skillet and stir to coat. In bowl, combine sour cream and parmesan cheese. Stir into pasta mix. Sprinkle mix w/ italian cheese. Cover, reduce heat to medium. Cook until cheese is melted, about 5 mins.