Butter your bread and place it on an ungreased baking sheet. Top the bread with a generous sprinkling of sugar and cinnamon. Place under the broiler for 2-3 minutes or until the edges are just browned. Watch it carefully so it doesn't burn. Let it cool slightly before serving so the sugar can set.
Notes
This could also be made in a toaster oven. (Toaster oven, NOT toaster.) The above measurements are just a guideline, use less or more of each to your preference.