Instead of the all purpose paleo flour you can use also half-half of almond flour and cassava flour.
I would recommend parchment paper instead of ghee/coconut oil and flour. It is not that easy to transfer later the cake from the baking pan to a plate. With the parchment paper it is easier to lift it.
Instead of icing sugar you can use also sprinkled chocolate for example or simply omit decoration. It looks good also with none.
You can try muffins as well. They come out very well. Baking time: around 20 minutes.