Crunchy Turkey Sandwich Melts

• 4 sandwich
• 270 gr turkey (chopped cooked)
• 80 ml kraft mayo mayonnaise (light)
• 55 gr kraft natural cheddar cheese (shredded)
• 16 gr onion (finely chopped)
• 10 ml kraft pure prepared mustard
• 1 gr pepper
• 8 slices claussen sandwich up