Preheat toaster oven or broiler. Lightly toast bread slices in toaster oven or under broiler, turning once if necessary.
Meanwhile, cut pear lengthwise into quarters and cut out stem and core. Cut each quarter lengthwise into thin slices. Place on toast.
In a small bowl, toss together cheese and cinnamon. Sprinkle evenly over pear slices. Broil in toaster oven or under broiler just until cheese is melted, about 2 minutes.
Cut each bread slice diagonally into quarters and serve immediately.