Garden Zucchini Chowder

Name: Garden Zucchini Chowder
Ingredients: 2 medium zucchini (chopped); 1 medium onion (chopped); 2 tablespoons parsley (fresh, minced); 1 teaspoon basil (dried); 1/3 cup unsalted butter (cubed); 1/3 cup all-purpose flour; 1 teaspoon salt; 1/4 teaspoon pepper; 3 cups water; 3 teaspoons chicken bouillon granules; 1 teaspoon lemon juice; 14.5 ounces diced tomatoes (undrained); 12 ounces evaporated milk; 10 ounces corn; 1/4 cup Parmesan cheese (grated); 2 cups cheddar cheese (shredded); 1 pinch granulated sugar (optional); fresh parsley (for garnish)