I just spray a little cooking spray in the center and spread it around with a piece of paper towel then break the egg into the cooker and beat it. Close the lid and cook for 50 seconds and it come out perfect for an muffin or a "Breakfast Jack". My oven is only 1000 Watts so if yours is 1100 try a shorter time. Washes clean in seconds with a soapy sponge. I broke the top off of mine right out of the box but it doesn't matter, you can just lay it on top as they don't latch or anything.
If you want to do an egg without scrambling it you still need to scramble the yolk a little and put a small plate on top of the lid because it will pop up a bit when the yolk starts to cook. I love this because I'm too lazy to clean up a pan and a bowl just to get an egg, this way I can have one anytime I want to. In less than 2 minutes the cooking and clean up are done.