J.C.
Sorry but these ovens are a complete waste of money. The treats are so small and they come out of the oven practically inedible. My daughter would not even eat it.
My advice is to take the oven back and buy a little chef's hat, apron and get a set of measuring cups, spatula etc. for your son.
Search Easy bake ovens on Mamapedia. Quite a few people have asked about them and everyone that responds pretty much says the same thing...don't buy it.