In a large mixing bowl, combine chicken, cream cheese, buffalo sauce, and white cheddar. Slather on bread and form sandwiches, then set aside. In a sauté pan over medium heat, melt butter.
Place on a baking tray and grill for 7–10 minutes on each side, or until firm but still succulent. Remove from the grill and set aside. Grate cucumber into Greek yoghurt and season to taste. Spoon ...