After the eggs are already made and served, I only put black pepper on them. Ketchup has no place on a breakfast table.
When making the eggs, I use the standard milk and butter, usually mix in bacon pieces and lots of shredded cheese, too.
Brewer’s yeast. Like the flavor it gives. In addition, it is a terrific source of taurine. This article also states that it contains selenium and zinc which are good natural supplements for our health.