Cook the meat in a large Dutch oven over medium-high heat until browned, stirring to crumble. Drain meat well, and set aside. Wipe out pan with a paper towel, and coat with cooking spray.
Place the pan over medium-high heat until hot. Add the diced onion, diced bell peppers, and minced garlic, and sauté 5 minutes or until tender. Add zucchini, and sauté 5 minutes. Drain vegetables. Return meat and vegetables to pan, and stir in dried oregano, salt, black pepper, and crushed red pepper. Cook mixture over medium-high heat 5 minutes. Add sugar, crushed and stewed tomatoes, tomato paste, and roasted red bell peppers to pan, and bring mixture to a boil. Reduce heat, and simmer 1 hour or until sauce is thick. Serve the meat sauce over pasta.