+1 for oatmeal (1/2 cup water per packet, a little milk on top). It's the one time I don't feel so guilty about eating the higher sugar stuff. Bananas are pretty safe for me, too. For a long run (2 hours+), 2 packets (and carry food/water), shorter day (1 hour+), 1 (and carry water), if it's just less than an hour probably nothing as long as it's first in the morning or I've eaten a couple of hours ago.

If it is one of those "first in the morning" shorter deals I might grab some gel or shot bloks/chomps before I go just to have some energy in me, especially if I wake up hungry and am too impatient to eat. I've done long runs on "nothing" too but it feels better to have something in the tummy.

For long runs (2 hours+), nothing super high fiber (kashi golean oatmeal/cereal/roll is too high, and the "high fiber" branded oatmeals are too, for me). I have the same problem with long/hard rides (or bricks), too... too much fiber makes colby's tummy go something-something.

I've been able to do creamy pb on toast/english muffin in place of oatmeal and done okay, too. I've done bagel with creamy pb, too, at least once. Not sure about crunchy PB - haven't had the opportunity, both times I was eating someone else's sacrilegious creamy PB