I wasn't a big veggie eater as a kid. My mom had a couple of tricks that worked. For green beans, she browned up some bread crumbs in oil, then put the beans in. Something about that crunch made green beans interesting. Also, when all else failed, pouring or melting cheese on top on top of veggies seemed to work.
Mashing veggies also worked, and I still puree some veggies now. Things like cauliflower and various types of squash pureed with a little cream and some butter are fantastic.
Hiding cooked greens in tomato sauce is easy and you can barely taste the difference. Also dicing up a bunch of veggies in meatloaf is something I do.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine