I've done a group ride (Great River Ride) several times in Western Massachusetts/Berkshires. It's in mid-October so usually on the cool side (or, downright cold first thing in the morning). They've got a traditional baked potato stop with all the fixings which really, really hits the spot. I did the ride one year where the weather started off sketchy but was supposed to clear up, get sunny, and with milder temperatures. But, that never happened. The whole ride was raw, cold, and rainy. I can say that a hot baked potato NEVER tasted so good as that one.
Another fun rest stop food that I enjoyed and was a bit unusual in my experience was a fluffernutter. Probably more because it hearkened back to my childhood and I hadn't had one in years ... actually, decades.