Preheat oven to 400°.
Combine 1 1/2 tablespoons oil and potatoes on a large jelly-roll pan coated with cooking spray, tossing to coat. Sprinkle with 1/2 teaspoon salt and 1/4 teaspoon pepper. Bake at 400° for 40 minutes or until tender, stirring after 25 minutes. Add garlic; toss well. Bake an additional 5 minutes or until potatoes are done.
Combine remaining 1 1/2 tablespoons oil, remaining 1/2 teaspoon salt, remaining 1/4 teaspoon pepper, chives, and remaining ingredients, stirring with a whisk. Drizzle over potatoes; toss gently.