When you have a child with food allergies/intolerance's you need to make your life easier by stocking up. I make one cake and separate them into single servings and freeze them. Then I am not scrambling to make an unexpected cake in times of pop up social plans, last minute birthday parties, or other social events. Life happens, and unexpectedly wheat cupcakes will be served somewhere and he has to do without. But it's comforting for him to know that he has his cake at home and he can have a piece later.
I then keep in Ziploc bags.
The cake mix is a Betty Crocker gluten free cake mix and I just put sprinkles on it.