Use pulsing action to process bread crumbs, mayo, seasonings and half the beans in food processor until well blended. Transfer to large bowl; mix in celery, cilantro and remaining beans. Shape into 6 (1/2-inch-thick) patties.
Cook in skillet sprayed with cooking spray on medium-high heat 5 min. on each side or until done (160ºF). Top with Singles; cook 1 min. or until melted.
Fill buns with lettuce, cheeseburgers, salsa and sour cream.