New here so hope you don't mind my responding.
Personally I find that almonds, raisains and bananas work for me, I must admit that during the summer on rides over 3 hours long I am inclined to bring an energy drink - usually high 5 - 4:1. However these days and at this time of year, rides are at an easy pace so I'm less inclined, any high paced spins are full on sprint sessions so no need for any food.
So in closing, Almonds, Raisains, Bananas. Just like you said!