Heat oil in 4-quart saucepan over medium-high heat. Add onion and garlic and cook for 2 minutes, stirring occasionally. Stir in soup, milk and water and heat to a boil. Stir in potatoes, zucchini and corn. Reduce heat to medium-low. Cook for 35 minutes or until potatoes are tender, stirring occasionally. Stir in chicken and parsley and cook until mixture is hot and bubbling.