This would make a frugal family or homeschool project. It will teach math, reading, life skills and more.
You would first need to do some online research about the elements you would like added to the cookbook. Some suggestions are:
table of contents
this for that information
information on the different types of apples
classify baking apples
information on freezing apples, or the finished recipes
why you should never eat apple seeds (hint: poison)
You may also want to add a photograph of finished recipes, or of your children making each recipe. A nice two-page spread would be the recipe and picture on one page, and a journaled story about making or eating the dish on the next page.
You may also want to make this book in the shape of an apple for something fun to do.
You will want to use only your favorite holiday/harvest apple recipes, so you will have to try them all out first. This can be a lot of fun. You will also want to make sure that you now how to prepare relevant recipes for the freezer.
Here are some pumpkin recipe ideas:
apple cake with cream cheese frosting