I mentioned in my last post that I put a "frying pan dome" or something over the nachos to make the cheese melt. To clarify, I just put a hot frying pan upside-down over the plate. It's very easy. Look, here is a picture to show you how easy it is:
And here is another picture to show you even more how easy it is:
Just make sure the pan is both hot enough to melt the cheese, and big enough so that the stuff doesn't touch the pan. Just leave it covered until the cheese is sufficiently melted. Ta-da!