Favorite breakfast: the coffee and beignets from Cafe Du Monde in New Orleans. Happily, they have a mix which is just super.
Normally, I eat a small breakfast simply because I can't face the volume of food that early in the morning, nothing to do with eating healthy (!), but end up eating breakfast food for another meal. Especially on Saturdays at the office during tax season, an early lunch (since they only serve it until 11) might consist of the very classy McGriddle, one of the finest fast food inventions of whatever century they were invented in, or an equally healthy Egg McMuffin.
In my much much younger days, they used to start serving breakfast at midnight at the BK (Burger King, that is) across from TKTS, so I used to wait until at least midnight before heading home from a night of theater or a night of frivolity, so that I could get that piping hot, fresh sausage and cheese croissant before heading home. In those days, I worked out like a demon and could easily process that kind of food at midnight; these days, if I eat breakfast at midnight, I just end up feeling like I'm gained another five pounds the next day.