All you need is some velveeta/gubmint cheese, regular azz white bread and butter...maybe a little mayo on the outside of the bread to help brown it.
You can add other cheese to the velveeta to make the flavors pop. Add tomato or meat for something different. Grilled cheese is simple. Some chefs can take simple shyt and make it great. Other chefs are good with fancy shyt but short circuit their brains when they gotta do something simple. You can't dress up grilled cheese in fancy shyt.