If we're including toasted sandwiches, my favourite, using a proprietary brand sandwich toaster is cheese bean & ham.
Butter (or margarine) the bread on what will be the outside of the sandwich.
Place the first (bottom) two slices in the toaster. (mine makes two at once)
Mould the bread into the depressions in the toaster and put (Heinz) baked beans into the hollows provided.
Add slices of cheese to completely cover the beans, and provide a seal to keep the beans in.
Add sliced ham, then the top slices of bread.
Close the toaster, allow about 5 minutes, open & serve.
Watch out, the beans tend to retain heat much better than any other part of the sandwich.