Here's how I handle picky eaters:
Involve them in food prep. I ask their opinion on seasonings, recipes, condiments to set out, anything at all. "Do you think the applesauce needs more cinnamon?"
Hand them a sharp knife and let them chop something up. Lots of us feel empowered by getting to use The Sharp Knife, especially if we've never had the chance yet. (Heck, I still get excited and I've been in charge of the knife drawer for years!) If a knife isn't a good choice, at least give them a whisk. "Would you cut these apples into slices crosswise so we can look for the star in the middle? 3yo will think that's pretty cool."
Serve buffet style. Something about walking around the island or down the countertop holding a plate and making choices for yourself can be a new, empowering experience for some kids. I might make a suggestion to try a dish, but don't apply pressure. (Not saying you do, at all.) As in "Hey, you want a glob of peanut butter to dip those pretzels in?"
Sit together and enjoy the company! I like to compliment my own cooking and smack my lips in satisfaction if the kids are too quiet. Oh, yes...everybody cleans up, also. No matter how bad I want to cringe at the "help" I'm receiving. :D
In short, I think I just try to make the eating itself a non-issue. I am a chubby, jolly woman in the kitchen because most of the time I love being there, and I love sharing the space with helpers. With time, it seems the picky eaters start wanting to branch out. Maybe it's just a matter of exposure, not sure.
Allrighty, I am new and don't really know anything, so take what you can use and ignore the rest. You're doing good, DB!