The substance of my favourite breakfast varies depending on how I'm feeling. There is one constant, though, it is ideally sufficiently large in caloric and nutritional content to get me started, and ideally there's plenty of coffee... or VERY occasionally beer.
Some days I'll enjoy about a pint of plain oats as much as a hungryman's breakfast or a full english-esque sort of thing, or my cast-iron skillet full of a frittata sort of thing (sp?) made with an assortment of meats and vegetables mixed in with eggs. I suppose I've got a bit of an obsession with a frying pan.