Cook noodles to desired doneness as directed on package. Drain; rinse with hot water.
Meanwhile, heat oven to 350°F. In large skillet, cook ground turkey until no longer pink. Stir in tomato sauce, tomato paste, sugar, basil, garlic powder, oregano and pepper. Stir in cooked noodles.
In medium bowl, combine cheese, sour cream, milk and onion; beat until smooth.
Spoon 1/2 the noodle mixture into ungreased 12x8-inch (2-quart) baking dish. Top evenly with cheese mixture. Spoon spinach evenly over cheese mixture; top with remaining noodle mixture.
Bake at 350°F. for 35 to 40 minutes or until thoroughly heated.