This is a one dish meal that will knock everyone's socks off. It is very hearty; serve on a plate with just some salad and good bread. It is a meatless meal, but you will get good protein from the pine nuts in the pesto, and the green beans in the pasta, with the cheese in the pesto sauce rounding off the protein. Nice with a crisp white wine.
You can use spaghetti instead of linguine, but do try to use some kind of stringy pasta that can wrap itself around the potatoes and beans. You can add two tablespoons of butter if you wish. Add it to the pesto that gets placed in the oven to get warmed. The only real advantage to heating the pesto in the bowl in the oven is that it also gets the bowl nicely heated for the pasta. You could also gently warm the pesto in a small dish in a microwave -- gently! you don't want to cook it at all! As for the pesto, don't hang yourself if you want to use pesto from a jar. If you don't have a food processor or it is the dead of winter and the local grocery store wants an arm and a leg for fresh basil, buy the jar. If, however, it is summer and you have a food processor, or a neighbour has one you can borrow for 15 minutes, consider making your own pesto -- it's a snap with a food processor! There's an easy Pesto recipe on this site.