Hi, St. James United Church,
My favorite kind of Cooking Workshop involves"Bible times" foods. I enjoy thinking about the differences and similarities between then and now; it helps me walk in "Bible sandals." Since you're exploring a Roman Centurion's life and faith, you might use the Cooking Workshop to highlight the fact that his food would have been prepared by his servants. The Bible text even tells about how the Centurion is accustomed to giving orders to those under him.
A good background article is http://www.historyforkids.org/...s/food/romanfood.htm.
Another website that had Roman recipes is http://www.pbs.org/wgbh/nova/a...t/roman-recipes.html. I thought the "Boiled Eggs in Pine Nut Sauce" was very do-able and both normal and exotic enough to be interesting.
I know it's not the cookie idea you were looking for, but it might be a fun change of pace. The book mentioned at the first web site (Spend the Day in Ancient Rome http://www.amazon.com/Spend-Day-Ancient-Rome-Activities/dp/0471154539/ref=sr_1_1?ie=UTF8&qid=1359384962&sr=8-1&keywords=Spend+the+Day+in+Ancient+Rome) looked useful and was well reviewed. You might even find something like it in your local library.
Let us know what you decide to do!