Crumble sausage and turkey into a large nonstick skillet coated with cooking spray. Add the mushrooms, green pepper and onion. Cook and stir over medium heat until meat is no longer pink; drain. Stir in the puree, tomatoes, tomato paste, bay leaves and seasonings. Bring to a boil. Reduce heat; simmer, uncovered, for 30 minutes.
Discard bay leaves. Serve desired amount with spaghetti. Cool remaining sauce; transfer to freezer containers. Freeze for up to 3 months.
To use frozen sauce: Thaw in the refrigerator overnight. Place in a saucepan and heat through.