Heat grill. In medium bowl, combine ground chicken, bread crumbs, sour cream and soup mix; mix well. Shape mixture into 6 patties, 1/2 inch thick.
When ready to grill, place patties on gas grill over medium-high heat or on charcoal grill 4 to 6 inches from medium coals. Cook 10 to 15 minutes or until burgers are no longer pink in center, turning once.
To serve, layer lettuce, tomato and burgers in rolls.