Unfortunately, you can't send home-baked goods.
From the page:
"Things NOT to Send: - Home-cooked anything. Note: Due to concerns for the health and safety of the soldiers, and as much as we don't want to say this, please do not send home-cooked anything to soldiers other then to your relatives or people who know you. Factory packaged only. Sorry. The soldiers are told to throw away anything that is not in a factory package."
These people are doing a great job helping us help our Troops.