In a large bowl, combine the potatoes, red peppers, squash, sweet potato and onion. In a small bowl, whisk the oil, vinegar and seasonings. Pour over vegetables and toss to coat.
Transfer to two greased 15-in. x 10-in. x 1-in. baking pans. Bake, uncovered, at 425° for 30-40 minutes or until tender, stirring occasionally.
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