First, old school, classic.
ingredients
White bread
Melting cheese, Velveeta or most "melting cheese" will work
Real butter
Step one prep the griddle just under 350 F
While griddle is heating up, butter one side of each piece of bread
Cut a slice and a half per sandwich, ensures full coverage and a tastier sandwich
Place all the slices on the griddle butter side down, and let sit for a couple minutes
Then move the cheese onto one side and cover with one of the other slices
Then once the cheese is melted a little and both sides are toasty brown...enjoy
For you griddless people or lazy, I have another way I'll post later. There's other additions like ham
and onions and green peppers and all kinds of variations. Whichever fits your pallet.