Without a doubt, my favorite way to eat green beans is to roast them in the oven with some olive oil.
It's so easy, just chop off the ends, cut them in half if they're really long, and then toss them in a bowl with olive oil, salt, and pepper. Put them on a baking sheet in a single layer, into a 375 oven for 5 or 6 minutes, and then take them out and stir them around, because their bottom sides will be getting brown and you don't want them to burn. Back into the oven for another 5 or 6 minutes, and they're ready to eat.
This makes them a little sweet and gives them a nutty roasted flavor that makes it hard for me to wait until they've cooled off to eat them.
Why would anyone ever eat canned green beans again, when they could do this instead?