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If you’ve accidentally deleted your Power Apps Portal Management Application you can get it back pretty easily as it is just a model driven app. Here is how to do it:

1. Login to the Power Apps Portal.
2. Click on New App and Select “Model-driven”:
   
3. Enter the details of the app and ensure you select “Use existing solution to create the App”
   
4. Click Next
5. Select “Dynamics 365 Portals – Portal Base” as the solution and “Dynamics 365 Portals” for the site map:
   
6. Click Done
7. Click Publish on the next screen.