1. In a large skillet, saute 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.
2. Add soup mixture and mix well.
3. Transfer to two greased shallow 2-qt. baking dishes. Sprinkle with remaining stuffing mix.
4. Bake, uncovered, at 350° for 30-35 minutes or until vegetables are tender and edges are bubbly.