Skinny Avocado & Tomato Tuna Melts

sandwich thin (like Ozery Bakery One Buns)

( 5 oz) can chunk white albacore tuna (in water)

white wine vinegar

of an avocado diced

roma tomato, diced

diced green onion

salt & pepper

slices reduced fat medium cheddar cheese (or shredded cheese)

finely chopped lettuce to top *optional

Greek yogurt or Bolthouse Farms Cilantro Avocado Yogurt Dressing!