Encodings

1) Encode powershell

$text = "[Your PowerShell Command]"
$encoded = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($text))
Write-Output $encoded

Altering Powershell Execution Policies

powershell.exe -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -EncodedCommand [Your Base64 Encoded Command]