I would double the french beans next time. Didn't have much flavor, IMO. If you use powdered/prepared pesto, I'd add some fresh basil to make it more real.
I made this as a side dish alongside "Chicken Cardinale" tonight and it paired very nicely with it. The combination of potato and green bean reminded me a bit of artichoke hearts. My DH mentioned that he could not envision eating this as the main course, however enjoyed it as a side.