. Combine first 3 ingredients in a large bowl, stirring well with a whisk. Add turkey and next 3 ingredients; stir just until blended. Divide mixture into 5 equal portions, shaping each into a 1/2-inch-thick patty.
. Coat both sides of patties with cooking spray. Place patties on grill rack coated with cooking spray. Grill 8 minutes on each side or until done. Spread 1 tablespoon Mango Mayonnaise on bottom half of each bun; top with 1 lettuce leaf, 2 tomato slices, 1 patty, 3 cucumber slices, and top half of bun.