Heat vegetable oil in large saucepan over medium-high heat. Add onion; cook, stirring occasionally, for 3 to 4 minutes or until tender.
Add 4 cups corn; cook, stirring occasionally, for 4 to 5 minutes or until tender.
Add water and bouillon; cook, stirring frequently, for 15 minutes or until corn is very soft.
Place corn mixture in blender or food processor; blend until smooth. Return to saucepan. Stir in remaining corn, evaporated milk, bell pepper and rosemary.
Cook, stirring frequently, for 5 to 10 minutes or until chowder is thick and bell peppers are tender. Season with salt and pepper. Garnish with basil.
Servings: 6