Put your bread into a frying pan or skillet then just a bit of butter in the empty hole and crack an egg into it. Salt & pepper to taste. You can just cook it like a grilled cheese sandwich over medium heat and flip it when it gets toasty. You can also add a piece of your preferred cheese and ham, salsa or most anything you like. My kids used to fight over who got the "holes"! Try it with a bagel or any kind of bread you can imagine.
Salt & pepper to taste.