my oldest is 8--he loves the Kids Can Press Jumbo Vegetarian Cookbook
http://www.kidscanpress.com/kidscanp...KCP/f_home.htm
it has a ton of recipes that kids will love to eat and can make on their own
It clearly marks recipies as easy, intermediate, and hard.
ds is able to do all but the hardest on his own, although I hover endlessly when he is using the stove.
we actually all use that cookbook a lot. The brownies page is just at that wonderful point where you don't have to hunt for it anymore--the book just opens up to it.
Oh yeah--the cookbook also marks the vegan recipes...and even the regular veggie ones are typically easy to modify to vegan (as are most things once you do it enough...)
hth, although it sounds like you are looking for something for a younger child maybe...
still a good book though!