LucD you provided in 2011 below

$VM = (Get-Content c:tempservers.txt)
foreach($vm in Get-VM -Name $VM){
    Shutdown-VMguest -VM $vm -confirm:$false
    while ($vm.ExtensionData.Runtime.PowerState -eq “poweredOn“){
        Start-Sleep -Seconds 2
        $vm.ExtensionData.UpdateViewData(“Runtime.PowerState“)
    }

    New-Snapshot -VM $vm -name (get-date)

    Start-VM -VM $vm

}

I think above still work, but we are in 2020 , did the powecli team added any better way to handle this or this is it now as well.

Thanks