Bowl of shredded wheat typically. Some honey for flavor.
I ride 9.7 miles to work and it takes 30 minutes, I'm hauling as fast as I can to make it a workout.
I decided once this week I'd do it before eating anything. I went out and felt the same as if I'd eaten.
The endorphine buzz kept me from feeling hungry though and I forgot to eat my breakfast once I got to work. Had it with lunch (cottage cheese and yogurt with shredded wheat) and drank a bunch of water through the day.
That day i decided to go the long way home to stop at the LBS so it was a 22 mile evening ride. I only had water with me, didn't eat a snack before leaving work. I started to feel a little weaker on the last 6 miles. I think it could have happened anyway, but I thought the main thing I did was change my eating routine.

I have a fairly strong stomach though so I can eat up and then hit the road within 5 min and feel relatively fine.