Preheat oven to 425°.
Combine first 7 ingredients in a jelly-roll pan; toss to coat. Bake at 425° for 30 minutes or until vegetables are tender.
Combine broth and remaining ingredients in a large Dutch oven; bring to a boil. Reduce heat; simmer 15 minutes or until potato is tender.
Add the roasted vegetables to potato mixture. Place half of vegetable mixture in a blender, and process until smooth. Pour puréed mixture into a large bowl; repeat procedure with remaining vegetable mixture. Return to pan; cook 5 minutes or until thoroughly heated.