1
Divide pepperoni evenly among 4 slices bread; top each with 1/2 cup cheese. Cover with remaining 4 slices bread.
2
Heat large griddle over medium-high heat (375ºF.).
3
Meanwhile, spread top of each sandwich with butter. Place sandwiches butter-side-down on hot griddle. Spread butter on top of each sandwich. Reduce heat to medium (300ºF.).
4
Brown bottom of sandwiches 2 to 3 minutes; turn sandwiches to brown other side until cheese is melted. Cut each sandwich into 4 triangles.