Have you tried smoothies....
I have a magic bullet mixer...love it!
I take frozen fruit...blueberries, strawberries, peaches...etc. Regular fruit can be used too...like bananas.
I then use frozen yogurt or ice cream....... or regular yougurt works great too. I sometimes add a little orange juice....but any juice will do....even sometimes milk. I will add slim fast for extra fiber for my older dd.
The good thing about smoothies is that you can mix it up...tweek it.
Blend and serve....it is kind of like a little frozed treat.
I also tried making frozen bananas....you freeze the banana and then dip it in chocolate. I suppose you could try this with any fruit.
Veggies is tough...I usually just try to add it to spagetti sauces. I also try to do fun dips for the veggies. My kids like ranch a lot and also melted cheese.
These are just a few tricks I have tried recently.
Good luck,

Heather