3liberally spread the mustard on the bread make sure you are generous and get to the edges.
4grate your own cheese or buy it shredded. I like extra sharp chedder but any kind will do and i am sure you can sub other cheeses if you like. We like a lot of cheese so i just add til it looks good..
5use non stick cookie sheet or cover with some foil.
6put loves in oven and let cook until bubbly and cheese is melted. You can turn the broiler on the last 2 minutes but watch close.