Blue Cheese-and-Green Onion Potato Salad

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

Bring potatoes, 1 tsp salt, and water to cover to a boil. Cook 10-15 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.
Makes 8 servings.