Preheat oven 425. On baking sheet, drizzle 1 tsp. of olive oil; layer all potatoes (tossed in 2 tsp olive oil) and bake 35-50 min. stir/toss occasionally until well browned and tender. Transfer into large bowl. Meanwhile, heat remaining oil and onions until golden and tender; approx. 12-15 mins. Transfer into same large bowl with potatoes. Add all remaining ingredients and mix well. Serve warm, room temperature or cold.