1. On a large cutting board, place both slices of bread down and spread the mayonnaise across both slices of bread. Next, on one piece of bread, spread the cranberry sauce, then add the cheese slices.
2. Place the oven roasted turkey breast in a single layer on top of the cheese, then sprinkle the chopped walnuts on top. Place the other piece of bread, mayo side down, on top of the walnuts.
3. Heat a non-stick frying pan over medium heat. Spread 1 tbsp of butter on the top of the sandwich, then place the buttered side down on to the pan. Use the remaining butter to butter the other side of the sandwich.
4. Place a lid on the frying pan and turn the heat to low. Cook the sandwich for 4-5 minutes on one side, before carefully flipping the sandwich and cooking it on the other side for another 4-5 minutes or until the cheese has melted. Remove the sandwich to a plate and enjoy!

If you have extra sandwich, you can store it in the fridge, in an airtight container for 1-2 days. It tastes great cold too!