A fairly typical UK breakfaster here: cereal (non-sugary) and fruit for breakfast.
On weekends I have something more substantial, (veggie sausage, egg, and beans), but that's only because I have two meals a day at the weekend (I lie in till brunch time).
Donuts, american muffins, and anything like that? Sounds OK, but I imagine I'd be ravenous pretty quickly. My breakfast is around 200 calories and keeps me full all morning. A plain donut is around the same number of calories, but I'd be starving 5 minutes later.