Thanks for the quick reply!
It didn’t work out that way. I found a documentation on:
So, I generated a script
cd .. cd ~/MagicMirror npm start
Afterwards I generated a shortcut on the desktop with following path:
"C:\Program Files\Git\bin\sh.exe" -l -i "C:\Users\USER\npmstart.sh"
And it works. It starts the Bash and runs MagicMirror and leaves the Bash open in the background, so I can get back to it by pressing the Windows-Button. (remember, I run the MagicMirror on a tablet without keyboard and mouse)
In the Bash, I can stop MagicMirror with the onscreen keyboard by pressing Ctrl+C.