Blue Cheese and Green Onion Potato Salad

3 lbs new potatoes, quartered
2 tsp salt, divided
1/3 c. sliced green onions
1 (8 oz.) container sour cream
1/2 c. refrigerated blue cheese dressing
1/2 tsp freshly ground pepper
1/2 c. crumbled blue cheese

Bring potatoes, 1 tsp salt, and water to cover to a boil. Cook 10 to 15 minutes or just until tender; drain.

Stir together green onions, next 3 ingredients, and remaining salt in a large bowl; add potatoes and crumbled blue cheese, stirring gently to coat. Serve immediately or cover and chill until ready to serve.