Pre-heat your toaster oven to 425°F on the Bake setting.Spread butter or light mayo on the outside of your bread.Put your bread butter side down and spread cheese on it, then top with second slice butter side up.Remove the preheated pan and put the bread in. Cook until brown (about 5 minutes).Take it out carefully, flip with spatula and return it for another 3-4 minutes until the other side is brown as well.Cool, cut and enjoy.