First, get a non-stick pan on medium-high heat. You want it to be hot by the time you've got your sandwich ready for toasting. Then, grab two slices of your favourite bread. Slather generously some guacamole on one, and pile a few slices of cheddar on the other.
If you have flavoured cheddar (mine here is with caramelised onions), then all the better! Sandwich together and put it in the hot pan.
At this stage you should press it down - you can do it with a spatula, or if you're lazy like me, pile on a plate or two.
See how snuggly it looks under there?
After a couple of minutes, flip! Wait until it goes golden brown on the other side as well, and serve.
Ooey, gooey goodness.
By the time you've read this, this sandwich would be long gone.