In a large skillet, sauté onion in oil until tender. Stir in the soup and cheese sauce until blended; heat through. In a large bowl, combine the vegetables and 1 cup stuffing mix. Add soup mixture and mix well.
Transfer to two greased shallow 2-quart baking dishes. Sprinkle with remaining stuffing mix. Bake, uncovered, at 350 degrees for 30–35 minutes or until vegetables are tender and edges are bubbly.
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