Prepare pasta per package directions. Meanwhile, in medium saucepan over medium heat, add oil then onion, garlic, and oregano. Cook, stirring often, until onions and garlic are tender, about 5 minutes.
Add broth and bring mixture to a boil.
Add tomatoes and carrots. Lower heat and simmer until vegetables are tender, about 15 minutes.
Stir in chicken and pasta. Simmer to heat chicken through, about 2 minutes. Stir in basil. Season with salt and pepper to taste. Serve hot or refrigerate in plastic container and reheat before serving.