In large saucepan, combine potatoes, salt and enough water to cover. Bring to a boil. Reduce heat to medium; cover and cook 15 minutes.
Add green beans; return to a boil. Boil an additional 5 to 10 minutes or until vegetables are tender. Drain; rinse with cold water to cool.
In large bowl, combine cooked potatoes and green beans, bell pepper and onion; toss to mix.
In small bowl, combine all dressing ingredients; blend well. Add to salad; toss gently to mix thoroughly. Serve immediately, or cover and refrigerate until serving time.