Use a glass to cut the center out of the bread. Heat the pan and grease it with the butter. Put the bread into the pan and leave it there for about 30 seconds. Break the egg into the hole in the bread. Wait until the egg white cooks almost to the top of the egg in the bread. Flip it over. Do not flip this more than once. Wait another 30 seconds or so.
I tried greasing the bread and greasing the pan and I found that I liked it better when I greased the pan and not the bread. I use the bread that was cut out to mop up egg yolk. You can break the egg yolk after you crack the egg into the bread if you’re anti runny egg yolk.