01 -
Warm up a cast-iron pan on low heat. Slice your bread into half-inch thick pieces and shred both types of cheese.
02 -
Take a teaspoon of mayo and smear it over one side of both bread pieces.
03 -
Throw the butter in the pan, lay the bread mayo-side down, stack on the cheese, and close it up with the other slice (mayo-side facing up).
04 -
Cover the pan and let it cook for 2-3 minutes until the bottom turns golden.
05 -
Turn the sandwich over, cover the pan again, and cook for around 2 minutes so the cheese gets gooey and the other side browns.
06 -
Cut it into triangles and enjoy it right away while the cheese stays gooey.