Our answer to any kind of celebration is to bake cakes, cupcakes, cookies, or some similar sugary treat, but not everyone that we know is able to have sugar. Sometimes it can be difficult to know what to bake for these people. It just doesn't seem like a real birthday without cake, so our solution was to make a sugar free cake. I'm sure that you can find recipes for sugar free cakes, but we decided to keep it simple and buy packaged cake mix from Pillsbury.
To make the cake even more fun, we added cookies around the cake's edges. Hershey's makes sugar free chocolate chips, so we used the recipe on the back of the bag to make our cookies. Although the cookies don't taste quite like normal chocolate chip cookies, they do make a close substitute.
I think in the future we'll try to make sugar free desserts from scratch instead of from cake mix, but it's nice to know that the mix does make good cakes if we are in a hurry.