To make this gluten free, just use a gluten free box mix and gluten free all-purpose flour to prevent pan sticking. You’ll see in the ingredients I used a Krusteaz gluten free chocolate cake mix. For dairy free, use a dairy free cake mix, a vegan butter and non-dairy milk such as almond for the frosting. Also make sure any décor is dairy free. For egg free, substitute a flax egg in the cake.