Here is my recipe for 12 it’s slightly differnt.https://www.createdby-diane.com/2021/02/12-chocolate-cupcakes.html
Here are some other options for more cupcakes- sometimes just doubling doesn’t work, for the smallest batch, they were a bit dryer, so I added cream, larger batches don’t need it.
https://docs.google.com/document/d/1pyCos-CKwpLzOxUsubf3egDley_eytdYkqXuc49wlH0/edit?usp=sharing

Or do you advise making two separate batches?

Thank you for updating the instructions. The cupcakes turned out delicious! Definitely a keeper!

Hi Tanya, sorry for the confusion I rewrote the instructions as there was a typo and I realized it wasn’t clear.
In a medium bowl place cocoa, baking soda, and boiling water and whisk together. Set this bowl aside.
In a large mixing bowl whisk together melted butter, oil, sugar, vanilla, and salt.
Whisk in the egg.
Add the flour, baking powder, and cocoa mixture to the large mixing bowl and whisk it until it’s blended, then add in the heavy cream and mix until combined.
If you need any more help let me know 🙂
Happy Baking!