We had one once upon a time that I sold during a period of financial disaster, but I wish I still had it!
i dont recall the name of it but it's sold in homeschool circles and someone out there has to know the name of it. It had a blue cover and was the size of large index cards, and bound horizontal like the index cards. It was simply called cooking for kids or something like that. It had everything form the very simple (making a PB&J) to an entire dinner, step by step and in words and pictures. I wish I could remember the name, I'm going to try to find out!
A good book is Emeril's There's a Chef in My Family. My 7 yr old received this for christmas a few years ago and we've made almost everything in it, even the complicated receipes aren't. It's kind of pricey but if you buy it through scholastic mail order it's cheaper.
Meg