In a large saucepan bring water to a boil; add potatoes.
Cover and cook 25 to 30 minutes or until tender; drain.
If desired, peel potatoes.
Cut potatoes into cubes.
In a large bowl combine yogurt, parsley, basil, green onion, salt and pepper.
Add potatoes, peas and bell pepper; stir lightly to coat.
Cover; chill several hours