Heat a grill, griddle, or a large skillet over medium heat.
Spread the butter on one side of each slice of bread.
Place one slice of bread, butter side down, on the grill and top with one slice of cheese.
Top with second slice of bread, butter side up.
Grill until the cheese is melted and the bread is golden brown, about 2 minutes per side.
Remove from the heat, slice in half and enjoy!