On a flat surface, butter one side of each slice of bread, and flip them over. Layer the cheese between the bread pieces, and close the sandwich with the buttered sides facing out.
Grill it:
Heat a pan over medium-low to medium heat. Grill the sandwich for about 2 to 3 minutes, until the bread is golden brown. Flip and continue grilling until the cheese is melty.
Pack it for school:
If you are packing this sandwich for later, allow it to cool before slicing it in half and packing it in a hard lunch container. Pack fruit, veggies, and other healthy sides in separate compartments. Use an ice pack if needed.