Take these cauliflower twice baked potatoes. Your picky eaters may not like cauliflower, but chances are, they do like potatoes. By mixing the cauliflower with the potatoes and all the other things that make twice baked potatoes good (cheese, bacon, etc.), they'll be more willing to try it.
There's no need to hide or sneak vegetables into kids' food. Feel free to tell them what you're doing. This builds trust. And when they see how good (and familiar) the new foods look, they may just be willing to give them a try.
Cauliflower Twice Baked Potatoes image by Mark Thomas/Getty Images 2012, licensed to About.com Inc.