Overwrite

echo "Text to add" > C:\file.txt	Create/overwrite
Set-Content -Path C:\file.txt -Value "Text"	Create/Overwrite
"Text to add" | Set-Content C:\file.txt	Create/Overwrite
[System.IO.File]::WriteAllText("C:\file.txt", "Text")	Overwrite using .NET
echo.> C:\file.txt	Clear content
type NUL > file.txt	Create empty file or clear file