During witch kingdom would marshmallow candy have been made?

It's impossible to say for certain when marshmallow candy was first made, as there's no definitive historical record.

However, marshmallows likely originated in ancient Egypt and were made from a combination of plant sap and nuts. These early marshmallows were likely quite different from the fluffy treats we know today.

The modern version of marshmallow, with its gelatin and sugar base, didn't appear until the 19th century. This was due to the development of sugar refining and gelatin production.

So, while marshmallows have ancient roots, the specific candy we know today wouldn't have existed in any "witch kingdom".