Pretend Soup by Mollie Katzen, and Katzen's newer, Salad People are excellent cookbooks to use with preschoolers. Our two-year-old, Erik loves these books and they are equally appealing to adults.
Each recipe is spread over four pages, with ingredients, tips, set up and "kids tasks" all laid out, including a two-page spread for each recipe that shows the recipe steps by illustration (easy for kids to "read" the recipe as they follow along).
Fun, colorful veggie and fruit, soup, bread, breakfast "cookies," etc. recipes are good, healthy, real food NOT "kid food" full of sugar or the odd standbys of hot dog creations or mac and cheese.
We already bought Salad People, and gave another copy away as a birthday gift to friends. Pick these books up - they're great!