Melt the butter in a large pot over medium high heat. Add the onion, carrots and celery to the pot.
Cook for 5-6 minutes or until softened. Add the garlic and cook for 30 seconds more. Season with salt and pepper to taste.
Add the chicken, tomatoes, tomato sauce, Italian seasoning, chicken broth and potato to the pot; bring to a simmer.
Cook for 20-25 minutes or until potatoes are tender. Taste and add salt and pepper as desired.
Stir in the corn and green beans and cook for 5 minutes more. Sprinkle with parsley and serve.
