Cook pasta. Spray skillet with cooking spray; heat over medium-high heat. Add beef, onion and garlic salt. Cook 5 minutes or until beef is crumbled and no longer pink. Remove all but 1 tbsp drippings.

Add mushrooms and tomato paste; cook until mushrooms are tender. Add undrained tomatoes; reduce heat and simmer 5 minutes. Stir in pasta; simmer until hot.