Provencal New Potatoes

Name: Provencal New Potatoes
Ingredients: 2 pounds small new potatoes (look for the smallest you can find, the potatoes should be no bigger than 1 1/2 inches, if they are bigger, cut them into 1- to 1 1/2-inch pieces); 1 medium onion , sliced in the direction of root to top; 6 cloves garlic , crushed with peel on (do not remove peel); 2 to 3 small to medium vine-ripened plum tomatoes , or plum tomatoes, cut into 1 1/2-inch chunks; 10 pitted olives , green and black (Kalamata and Nicoise); 1/2 teaspoon red chile flakes; 1/4 teaspoon garlic powder; 1 tablespoon herbes de Provence; 1/2 cup extra virgin olive oil; 2 teaspoons red wine vinegar; 2 teaspoons kosher salt; Freshly ground black pepper; 1 tablespoon chopped fresh chives (for garnish)