I like some heartier bread, like sliced sourdough or peasant bread. Cheese is a mix of cheddar and 'Murican, or maybe something else that is melty. They are all pretty great. Butter in a hot pan, then BOTH slices go in the pan with the cheese split 50/50 between the two slices. Cheese melts faster this way and the whole thing cooks faster. When the bread is crispy you can put tomato slices or a little deli ham on top and then flip the two sides together. Sounds crazy but it works great.