Meanwhile, spray large skillet with cooking spray; heat over medium-high heat. Add Italian sausage, onion and garlic salt; cook 5 to 6 minutes or until sausage is crumbled and no longer pink, stirring occasionally. Remove and discard all but 1 tablespoon drippings from skillet.
Add mushrooms and tomato paste. Cook 2 to 3 minutes or until mushrooms are tender. Add undrained tomatoes; reduce heat and simmer 5 minutes. Stir in cooked pasta; simmer 2 minutes more or until hot.
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