Unable to invoke jupyter notebook in powershell (Unable to create process) (No such file/directory)

I have two installs of python and have added the following to my user path environment variable...
C:\Python\Python36\
C:\Python\Python36\Scripts
C:\Python\Python37
C:\Python\Python37\Scripts

I have installed jupyter notebook to the following location...
C:\Python\Python37\Scripts\

You can clearly see that jupyter-notebook.exe is indeed there. However, no matter what command I use I can't start it.

If I navigate to the directory where the exe is I can start the jupyter-notebook.exe just fine.

Therefore, why can't I invoke "python37 jupyter-notebook.exe" from my home directory or anywhere other than the location it resides? It's in my user path environment variable so I'm lost on what else to try.