Heat greased grill to medium-high heat.
Mix mayo and lime juice. Reserve 2 Tbsp. mayo mixture for later use; mix remaining with turkey, bread crumbs, onions and peppers just until blended. Shape into 6 (1/2-inch-thick) patties.
Grill 4 to 5 min. on each side or until done (165°F). Top with Singles; grill 1 min. or until melted.
Spread reserved mayo mixture onto bottom halves of buns; top with burgers, lettuce and tomatoes. Cover with tops of buns.