Place vegetables and garlic in an ungreased 15x10x1-in. baking pan. Drizzle with 2 tablespoons oil; sprinkle with salt and pepper. Bake, uncovered, at 425° for 35-40 minutes or until tender, stirring once., Meanwhile, in a large saucepan, bring broth to a boil. Add quinoa. Reduce heat; cover and simmer for 12-15 minutes or until liquid is absorbed. Remove from the heat; fluff with a fork., Transfer vegetables and quinoa to a large bowl. Whisk the vinegar, mustard and remaining oil; drizzle over vegetable mixture. Sprinkle with herbs: toss to combine.