One quick favorite is to take a slice of bread, cut out the middle (a knife, or you can use those fried egg container shapes), insert an egg, and fry in a pan. This can also be done in the microwave if wanted - you just have to modify the cooking technique slightly to adjust to the microwave.

I like to use those 2 plate sandwich toasters, so you can also toast the cutout. You can also drop this on top of the egg in the hole.

A recent modification is to place a second slice of bread and place some cheese on it, then slide the egged bread piece when solid on top, to glue it together.

You can also add things like thin tomato slices, or spreading some other flavoring, before sprinkling the shredded cheese, or adding sliced cheese.