Puree the fruit yourself and add to yogurt. Buy some plastic ice lolly makers - the warm weather will soon be here so you can use the pureed fruit in them.
Quiche or a frittata full of small bits of chopped veg, soften the veg a bit first before adding to the egg and cooking it is holdable for little hands.
Banana bread/cake.
Slices of toast with squashed banana or strawberries on top.
Pancakes with mushed banana/strawberries/raspberries/stewed apple/ whatever . Roll them up like a sausage so they are easy to grab.
carrots, cauli, peas and broccoli are good for mashing into potato.
Blitz down as many vegetables as you can to make sauces for pasta, rice or on top of potato.
Flapjacks made with oats - you can sneak many fruits in there and it keeps well too so you can make up a decent batch.
Mini pizzas - again chop the veg into tiny pieces and soften first.
Mash banana into porridge - again stewed apple would be good too or pears.
Teach them how to 'dip dip' with things like carrot sticks, sliced apple and whole strawberries into things like yogurt or even a little melted chocolate - if the dip is something they like they often hardly notice what they are using to dip dip and just eat it.
When they are older teach them about the Superpowers :)
You can't see in the dark if you don't eat up your carrots, broccoli gives you big muscles (we weren't a spinach family) Apples make you have strong teeth, are a few that were used and believed in my house.