Brown sausage in large nonstick skillet; drain. Stir in onions and tomato paste; cover. Cook 15 min. or until onions are tender and sausage is cooked through (170°F), stirring occasionally. Stir in dressing.
Sprinkle with parsley and cheese.
To Freeze: Freeze in freezer safe container
To Reheat: Cook pasta. Reheat sauce and combine.