Hello super joomlers!

Assuming your plugin was a system plugin named helloworld. (plg_system_helloworld)

The base structure of the link to access to your plugin directly from your Joomla! website backend would therefore be: 


https://www.example.com/administrator/index.php?option=com_plugins&filter.folder=system&filter.element=helloworld

You must of course replace any revelant value with your custom values based on your use case.

See you around for other tips and tricks.