Place Sandwich Bread (2 slice) on a cutting board and spread Mayonnaise (2 tablespoon) over top side of each.
Heat a small non-stick skillet over medium. Slide in half of Unsalted Butter (1/2 tablespoon)
When it melts, place 1 slice of bread, mayonnaise side down, in skillet. Top with thinly sliced American Cheese Slice (4 slice) and season with freshly ground Ground Black Pepper (to taste).
Top with second slice of bread, mayonnaise side up.
When underside is golden brown, about 4 minutes, turn sandwich and add remaining Unsalted Butter (1/2 tablespoon) to skillet. Press down on sandwich to encourage even browning and to help melt cheese. Cook until second side is golden brown and cheese is melted.
Eat immediately. Enjoy!