PREPARATION:
- Preheat oven to 375°F. Coat large saucepan with nonstick cooking spray; heat over medium heat. Add mushrooms, 1/2 cup onion, carrot, bell pepper and garlic. Cook and stir 4 to 5 minutes or until vegetables are crisp-tender. Stir in stewed tomatoes with juice, tomato paste, 2 teaspoons Italian seasoning, salt and black pepper. Bring to a boil over medium-high heat. Reduce heat to medium-low. Cover and simmer 20 minutes, stirring occasionally.
- Combine egg white, bread crumbs, remaining 2 tablespoons onion and remaining 1/2 teaspoon Italian seasoning in medium bowl. Add beef; mix until well blended. Shape into 16 meatballs. Place in 11X7-inch baking pan. Bake 18 to 20 minutes or until beef is no longer pink. Drain on paper towels.
- Stir meatballs into sauce. Return sauce to a boil; reduce heat. Simmer, uncovered, about 10 minutes more or until sauce thickens slightly, stirring occasionally. Serve over spaghetti.
