1Place sausages, bell peppers and onion in large bowl. Add dressing; stir to coat. Cover; refrigerate 30 minutes.
2Heat gas or charcoal grill. Drain sausages and vegetables; discard dressing. Place vegetables in grill basket. Place sausages on grill over medium heat; cook 12 to 15 minutes, turning frequently, until brown. Place grill basket with vegetables on grill; cook about 10 minutes, stirring frequently, until crisp-tender.
3Meanwhile, make potatoes as directed on box, using milk, butter, water and Cheese Sauce pouch.
4Serve sausages and vegetables with potatoes.