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The error means that Powershell is not aware where Hugo is installed. There is a system setting, PATH, that defines in which directories Powershell (and CMD shell) do look for executables. Since Powershell doesn't know Hugo's location, it will give the error you've encountered.

Now, there are a few solutions:

1. Add Hugo to path
2. Use absolute path
3. Set an alias

Adding Hugo's directory to system-wide path makes sense in some cases. The steps are well-documented in, say, Superuser answer. Usually this is not the best way, since path has maximum length, and it's not a best practice to stuff a lot of things there.

Using absolute path means that instead of hugo server, one does & "C:\Users\CHRIS\scoop\apps\hugo-extended\hugo" server. The amperstand & is call operator and tells Powershell to execute the quoted string.

Setting an alias will introduce a new command that is an alias to existing program or command. For Hugo, you might do set-alias -name hugo C:\Users\CHRIS\scoop\apps\hugo-extended\hugo. When you type hugo into the same Powershell prompt, Powershell knows that hugo is an alias that points into the executable's actual location.

Setting an alias can be done via a script, or saving its definition in Powershell profile.