How to Make Cheese on Toast without a Grill?

In the United Kingdom, cheese on toast has been a traditional after-school snack for children (and a magical cure for the midnight munchies after a night out on the town for adults) for at least many decades, if not longer. This alternative to a sandwich that only requires three ingredients is not only fast and simple to prepare, but it also manages to be gooey, tasty, and cozy all at the same time.